diff --git a/memento-note/extension/dist-chrome-store/sidepanel.css b/memento-note/extension/dist-chrome-store/sidepanel.css
index 7f85205..16b66a9 100644
--- a/memento-note/extension/dist-chrome-store/sidepanel.css
+++ b/memento-note/extension/dist-chrome-store/sidepanel.css
@@ -23,6 +23,8 @@ html, body {
   font-size: 13px;
   color: var(--ink);
   background: var(--paper);
+  overflow-wrap: break-word;
+  word-break: break-word;
 }
 
 .shell {
@@ -32,6 +34,20 @@ html, body {
   background: var(--paper);
 }
 
+/* Responsive : le side panel peut faire 280px (Chrome défaut) ou 480px+ (Firefox).
+   On adapte les paddings/margins en fonction de la largeur disponible. */
+@media (max-width: 380px) {
+  html, body { font-size: 12px; }
+  .header { padding: 12px 14px; }
+  .main { padding: 12px 14px 16px; gap: 12px; }
+  .footer { padding: 8px 14px 12px; }
+  .field span, .label, .sub { letter-spacing: 0.1em; }
+}
+@media (min-width: 420px) {
+  .main { padding: 20px 22px; gap: 18px; }
+  .header { padding: 18px 22px; }
+}
+
 .header {
   display: flex;
   align-items: center;
@@ -215,29 +231,33 @@ input[type="text"]:focus,
 }
 
 .page-card {
-  padding: 14px; border: 1px solid var(--border); border-radius: var(--radius);
+  padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius);
   background: #fff;
   box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
+  min-width: 0;
 }
 .page-card .sub {
-  font-size: 9px; text-transform: uppercase; letter-spacing: 0.14em;
+  font-size: 10px; text-transform: uppercase; letter-spacing: 0.14em;
   color: var(--muted); font-weight: 700; display: block; margin-bottom: 8px;
 }
-.page-row { display: flex; gap: 10px; align-items: flex-start; min-width: 0; }
+.page-row { display: flex; gap: 12px; align-items: flex-start; min-width: 0; }
 .page-row img {
-  width: 20px; height: 20px; border-radius: 5px;
+  width: 22px; height: 22px; border-radius: 5px;
   flex-shrink: 0; margin-top: 2px;
 }
 .page-text { min-width: 0; flex: 1; }
 .page-row .title {
-  font-size: 12px; font-weight: 700; line-height: 1.45;
+  font-size: 13px; font-weight: 700; line-height: 1.45;
   display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
   unicode-bidi: plaintext;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 .page-row .url {
   font-size: 10px; color: var(--muted); margin-top: 4px;
   white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
   direction: ltr; text-align: left;
+  max-width: 100%;
 }
 
 .text-rtl {
@@ -255,6 +275,7 @@ input[type="text"]:focus,
   min-height: 140px;
   display: flex;
   flex-direction: column;
+  flex: 1 1 auto;
 }
 
 .selection-panel.has-text {
@@ -263,24 +284,30 @@ input[type="text"]:focus,
   box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.12);
 }
 .selection-hint {
-  padding: 16px;
+  padding: 18px;
   border: 1px dashed var(--border);
   border-radius: var(--radius);
   text-align: center;
   background: #fff;
+  min-height: 120px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 .selection-hint p {
   margin: 0;
-  font-size: 11px;
+  font-size: 12px;
   color: var(--muted);
-  line-height: 1.55;
+  line-height: 1.6;
 }
 
 .selection-head {
   display: flex; align-items: center; justify-content: space-between;
-  padding: 12px 14px;
+  gap: 8px;
+  padding: 14px 16px;
   background: linear-gradient(180deg, #fff 0%, #fdfcfa 100%);
   border-bottom: 1px solid var(--border);
+  flex-wrap: wrap;
 }
 .selection-head .status {
   display: flex; align-items: center; gap: 8px;
@@ -293,24 +320,26 @@ input[type="text"]:focus,
   background: var(--paper); padding: 4px 8px; border-radius: 999px;
 }
 .selection-head .count.active { color: var(--accent); background: var(--accent-soft); }
-
 .selection-body {
-  flex: 1;
-  padding: 14px;
+  flex: 1 1 auto;
+  padding: 14px 16px;
   font-size: 13px;
-  line-height: 1.75;
+  line-height: 1.65;
   color: rgba(28, 28, 28, 0.88);
-  max-height: 220px;
+  min-height: 80px;
+  max-height: none;
   overflow-y: auto;
   unicode-bidi: plaintext;
   border-inline-start: 3px solid transparent;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 .selection-panel.has-text .selection-body {
   border-inline-start-color: #38bdf8;
-  padding-inline-start: 16px;
+  padding-inline-start: 18px;
   font-style: italic;
-  font-size: 12px;
-  max-height: 150px;
+  font-size: 13px;
+  min-height: 100px;
 }
 
 .pulse-dot {
@@ -328,15 +357,18 @@ input[type="text"]:focus,
 .clear-btn:hover { color: var(--ink); background: var(--paper); }
 
 .actions {
-  display: flex; flex-direction: column; gap: 10px;
-  margin-top: auto; padding-top: 6px;
+  display: flex; flex-direction: column; gap: 12px;
+  margin-top: auto; padding-top: 8px;
 }
 .btn {
-  padding: 14px 16px; border-radius: var(--radius); border: none; cursor: pointer;
-  font-weight: 700; font-size: 10px; text-transform: uppercase;
+  padding: 16px 18px; border-radius: var(--radius); border: none; cursor: pointer;
+  font-weight: 700; font-size: 12px; text-transform: uppercase;
   letter-spacing: 0.1em;
-  display: flex; align-items: center; justify-content: center; gap: 8px;
+  display: flex; align-items: center; justify-content: center; gap: 10px;
+  min-height: 48px;
   transition: transform 0.12s ease, opacity 0.12s ease, filter 0.12s ease;
+  word-break: break-word;
+  text-align: center;
 }
 .btn:active { transform: scale(0.98); }
 .btn:disabled {
@@ -361,8 +393,9 @@ input[type="text"]:focus,
 }
 .btn-secondary:hover:not(:disabled) { background: #e5e7eb; }
 .btn-sm {
-  padding: 10px 12px;
-  font-size: 10px;
+  padding: 12px 14px;
+  font-size: 11px;
+  min-height: 40px;
 }
 .btn-danger { background: var(--danger); color: #fff; }
 .btn-link.link-only {
@@ -372,8 +405,8 @@ input[type="text"]:focus,
   gap: 6px;
 }
 .btn-link {
-  background: none; border: none; color: var(--muted); font-size: 11px;
-  cursor: pointer; padding: 8px; font-weight: 500;
+  background: none; border: none; color: var(--muted); font-size: 12px;
+  cursor: pointer; padding: 10px; font-weight: 500;
 }
 .btn-link:hover { color: var(--ink); text-decoration: underline; }
 .btn-icon { width: 14px; height: 14px; display: inline-flex; }
@@ -505,3 +538,23 @@ html[dir="rtl"] .label,
 html[dir="rtl"] .sub {
   text-align: right;
 }
+
+/* Firefox sidebar : plus large que Chrome Side Panel par défaut,
+   on aère la mise en page. */
+@-moz-document url-prefix("chrome:") {
+  .shell { min-height: 100vh; }
+}
+/* Fallback : on cible aussi le web-extension panel de Firefox */
+@media (min-width: 480px) {
+  .selection-panel { min-height: 160px; }
+  .selection-body { font-size: 14px; }
+  .page-row .title { font-size: 14px; }
+}
+
+/* Très petits écrans (mobile debug, fenetres étirées) */
+@media (max-width: 320px) {
+  .brand-text { display: none; }
+  .header-right { gap: 4px; }
+  .icon-btn { width: 28px; height: 28px; }
+  .btn { padding: 14px 12px; font-size: 11px; }
+}
diff --git a/memento-note/extension/dist-chrome-store/sidepanel.js b/memento-note/extension/dist-chrome-store/sidepanel.js
index d441400..907aacf 100644
--- a/memento-note/extension/dist-chrome-store/sidepanel.js
+++ b/memento-note/extension/dist-chrome-store/sidepanel.js
@@ -160,18 +160,32 @@ async function getActiveTab() {
 }
 
 async function ensureContentScript(tabId) {
+  // PING initial : si le script est déjà injecté, on retourne immédiatement.
   try {
     const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
     if (resp?.ok) return true
   } catch {
-    /* inject */
+    /* pas injecté */
   }
+  // Sinon, injection manuelle via chrome.scripting.executeScript.
   try {
     await chrome.scripting.executeScript({ target: { tabId }, files: ['content.js'] })
-    return true
   } catch {
     return false
   }
+  // L'injection est async côté page : le script doit finir de s'initialiser
+  // (IIFE, listeners, flag globalThis) avant qu'on puisse lui parler.
+  // On PING avec retry pour attendre qu'il soit prêt.
+  for (let i = 0; i < 8; i++) {
+    await new Promise(r => setTimeout(r, 80 + i * 30))
+    try {
+      const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
+      if (resp?.ok) return true
+    } catch {
+      /* pas encore prêt */
+    }
+  }
+  return false
 }
 
 async function setPickModeOnTab(enabled) {
@@ -181,7 +195,7 @@ async function setPickModeOnTab(enabled) {
   try {
     await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
   } catch {
-    /* ignore */
+    /* ignore — retry au prochain syncPickMode */
   }
 }
 
diff --git a/memento-note/extension/dist-firefox/sidepanel.css b/memento-note/extension/dist-firefox/sidepanel.css
index 7f85205..16b66a9 100644
--- a/memento-note/extension/dist-firefox/sidepanel.css
+++ b/memento-note/extension/dist-firefox/sidepanel.css
@@ -23,6 +23,8 @@ html, body {
   font-size: 13px;
   color: var(--ink);
   background: var(--paper);
+  overflow-wrap: break-word;
+  word-break: break-word;
 }
 
 .shell {
@@ -32,6 +34,20 @@ html, body {
   background: var(--paper);
 }
 
+/* Responsive : le side panel peut faire 280px (Chrome défaut) ou 480px+ (Firefox).
+   On adapte les paddings/margins en fonction de la largeur disponible. */
+@media (max-width: 380px) {
+  html, body { font-size: 12px; }
+  .header { padding: 12px 14px; }
+  .main { padding: 12px 14px 16px; gap: 12px; }
+  .footer { padding: 8px 14px 12px; }
+  .field span, .label, .sub { letter-spacing: 0.1em; }
+}
+@media (min-width: 420px) {
+  .main { padding: 20px 22px; gap: 18px; }
+  .header { padding: 18px 22px; }
+}
+
 .header {
   display: flex;
   align-items: center;
@@ -215,29 +231,33 @@ input[type="text"]:focus,
 }
 
 .page-card {
-  padding: 14px; border: 1px solid var(--border); border-radius: var(--radius);
+  padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius);
   background: #fff;
   box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
+  min-width: 0;
 }
 .page-card .sub {
-  font-size: 9px; text-transform: uppercase; letter-spacing: 0.14em;
+  font-size: 10px; text-transform: uppercase; letter-spacing: 0.14em;
   color: var(--muted); font-weight: 700; display: block; margin-bottom: 8px;
 }
-.page-row { display: flex; gap: 10px; align-items: flex-start; min-width: 0; }
+.page-row { display: flex; gap: 12px; align-items: flex-start; min-width: 0; }
 .page-row img {
-  width: 20px; height: 20px; border-radius: 5px;
+  width: 22px; height: 22px; border-radius: 5px;
   flex-shrink: 0; margin-top: 2px;
 }
 .page-text { min-width: 0; flex: 1; }
 .page-row .title {
-  font-size: 12px; font-weight: 700; line-height: 1.45;
+  font-size: 13px; font-weight: 700; line-height: 1.45;
   display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
   unicode-bidi: plaintext;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 .page-row .url {
   font-size: 10px; color: var(--muted); margin-top: 4px;
   white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
   direction: ltr; text-align: left;
+  max-width: 100%;
 }
 
 .text-rtl {
@@ -255,6 +275,7 @@ input[type="text"]:focus,
   min-height: 140px;
   display: flex;
   flex-direction: column;
+  flex: 1 1 auto;
 }
 
 .selection-panel.has-text {
@@ -263,24 +284,30 @@ input[type="text"]:focus,
   box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.12);
 }
 .selection-hint {
-  padding: 16px;
+  padding: 18px;
   border: 1px dashed var(--border);
   border-radius: var(--radius);
   text-align: center;
   background: #fff;
+  min-height: 120px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 .selection-hint p {
   margin: 0;
-  font-size: 11px;
+  font-size: 12px;
   color: var(--muted);
-  line-height: 1.55;
+  line-height: 1.6;
 }
 
 .selection-head {
   display: flex; align-items: center; justify-content: space-between;
-  padding: 12px 14px;
+  gap: 8px;
+  padding: 14px 16px;
   background: linear-gradient(180deg, #fff 0%, #fdfcfa 100%);
   border-bottom: 1px solid var(--border);
+  flex-wrap: wrap;
 }
 .selection-head .status {
   display: flex; align-items: center; gap: 8px;
@@ -293,24 +320,26 @@ input[type="text"]:focus,
   background: var(--paper); padding: 4px 8px; border-radius: 999px;
 }
 .selection-head .count.active { color: var(--accent); background: var(--accent-soft); }
-
 .selection-body {
-  flex: 1;
-  padding: 14px;
+  flex: 1 1 auto;
+  padding: 14px 16px;
   font-size: 13px;
-  line-height: 1.75;
+  line-height: 1.65;
   color: rgba(28, 28, 28, 0.88);
-  max-height: 220px;
+  min-height: 80px;
+  max-height: none;
   overflow-y: auto;
   unicode-bidi: plaintext;
   border-inline-start: 3px solid transparent;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 .selection-panel.has-text .selection-body {
   border-inline-start-color: #38bdf8;
-  padding-inline-start: 16px;
+  padding-inline-start: 18px;
   font-style: italic;
-  font-size: 12px;
-  max-height: 150px;
+  font-size: 13px;
+  min-height: 100px;
 }
 
 .pulse-dot {
@@ -328,15 +357,18 @@ input[type="text"]:focus,
 .clear-btn:hover { color: var(--ink); background: var(--paper); }
 
 .actions {
-  display: flex; flex-direction: column; gap: 10px;
-  margin-top: auto; padding-top: 6px;
+  display: flex; flex-direction: column; gap: 12px;
+  margin-top: auto; padding-top: 8px;
 }
 .btn {
-  padding: 14px 16px; border-radius: var(--radius); border: none; cursor: pointer;
-  font-weight: 700; font-size: 10px; text-transform: uppercase;
+  padding: 16px 18px; border-radius: var(--radius); border: none; cursor: pointer;
+  font-weight: 700; font-size: 12px; text-transform: uppercase;
   letter-spacing: 0.1em;
-  display: flex; align-items: center; justify-content: center; gap: 8px;
+  display: flex; align-items: center; justify-content: center; gap: 10px;
+  min-height: 48px;
   transition: transform 0.12s ease, opacity 0.12s ease, filter 0.12s ease;
+  word-break: break-word;
+  text-align: center;
 }
 .btn:active { transform: scale(0.98); }
 .btn:disabled {
@@ -361,8 +393,9 @@ input[type="text"]:focus,
 }
 .btn-secondary:hover:not(:disabled) { background: #e5e7eb; }
 .btn-sm {
-  padding: 10px 12px;
-  font-size: 10px;
+  padding: 12px 14px;
+  font-size: 11px;
+  min-height: 40px;
 }
 .btn-danger { background: var(--danger); color: #fff; }
 .btn-link.link-only {
@@ -372,8 +405,8 @@ input[type="text"]:focus,
   gap: 6px;
 }
 .btn-link {
-  background: none; border: none; color: var(--muted); font-size: 11px;
-  cursor: pointer; padding: 8px; font-weight: 500;
+  background: none; border: none; color: var(--muted); font-size: 12px;
+  cursor: pointer; padding: 10px; font-weight: 500;
 }
 .btn-link:hover { color: var(--ink); text-decoration: underline; }
 .btn-icon { width: 14px; height: 14px; display: inline-flex; }
@@ -505,3 +538,23 @@ html[dir="rtl"] .label,
 html[dir="rtl"] .sub {
   text-align: right;
 }
+
+/* Firefox sidebar : plus large que Chrome Side Panel par défaut,
+   on aère la mise en page. */
+@-moz-document url-prefix("chrome:") {
+  .shell { min-height: 100vh; }
+}
+/* Fallback : on cible aussi le web-extension panel de Firefox */
+@media (min-width: 480px) {
+  .selection-panel { min-height: 160px; }
+  .selection-body { font-size: 14px; }
+  .page-row .title { font-size: 14px; }
+}
+
+/* Très petits écrans (mobile debug, fenetres étirées) */
+@media (max-width: 320px) {
+  .brand-text { display: none; }
+  .header-right { gap: 4px; }
+  .icon-btn { width: 28px; height: 28px; }
+  .btn { padding: 14px 12px; font-size: 11px; }
+}
diff --git a/memento-note/extension/dist-firefox/sidepanel.js b/memento-note/extension/dist-firefox/sidepanel.js
index d441400..907aacf 100644
--- a/memento-note/extension/dist-firefox/sidepanel.js
+++ b/memento-note/extension/dist-firefox/sidepanel.js
@@ -160,18 +160,32 @@ async function getActiveTab() {
 }
 
 async function ensureContentScript(tabId) {
+  // PING initial : si le script est déjà injecté, on retourne immédiatement.
   try {
     const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
     if (resp?.ok) return true
   } catch {
-    /* inject */
+    /* pas injecté */
   }
+  // Sinon, injection manuelle via chrome.scripting.executeScript.
   try {
     await chrome.scripting.executeScript({ target: { tabId }, files: ['content.js'] })
-    return true
   } catch {
     return false
   }
+  // L'injection est async côté page : le script doit finir de s'initialiser
+  // (IIFE, listeners, flag globalThis) avant qu'on puisse lui parler.
+  // On PING avec retry pour attendre qu'il soit prêt.
+  for (let i = 0; i < 8; i++) {
+    await new Promise(r => setTimeout(r, 80 + i * 30))
+    try {
+      const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
+      if (resp?.ok) return true
+    } catch {
+      /* pas encore prêt */
+    }
+  }
+  return false
 }
 
 async function setPickModeOnTab(enabled) {
@@ -181,7 +195,7 @@ async function setPickModeOnTab(enabled) {
   try {
     await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
   } catch {
-    /* ignore */
+    /* ignore — retry au prochain syncPickMode */
   }
 }
 
diff --git a/memento-note/extension/memento-web-clipper-chrome-store.zip b/memento-note/extension/memento-web-clipper-chrome-store.zip
index 0701cc7..cf739c7 100644
Binary files a/memento-note/extension/memento-web-clipper-chrome-store.zip and b/memento-note/extension/memento-web-clipper-chrome-store.zip differ
diff --git a/memento-note/extension/memento-web-clipper-firefox.xpi b/memento-note/extension/memento-web-clipper-firefox.xpi
index 62a9bba..77d5db0 100644
Binary files a/memento-note/extension/memento-web-clipper-firefox.xpi and b/memento-note/extension/memento-web-clipper-firefox.xpi differ
diff --git a/memento-note/extension/sidepanel.css b/memento-note/extension/sidepanel.css
index 7f85205..16b66a9 100644
--- a/memento-note/extension/sidepanel.css
+++ b/memento-note/extension/sidepanel.css
@@ -23,6 +23,8 @@ html, body {
   font-size: 13px;
   color: var(--ink);
   background: var(--paper);
+  overflow-wrap: break-word;
+  word-break: break-word;
 }
 
 .shell {
@@ -32,6 +34,20 @@ html, body {
   background: var(--paper);
 }
 
+/* Responsive : le side panel peut faire 280px (Chrome défaut) ou 480px+ (Firefox).
+   On adapte les paddings/margins en fonction de la largeur disponible. */
+@media (max-width: 380px) {
+  html, body { font-size: 12px; }
+  .header { padding: 12px 14px; }
+  .main { padding: 12px 14px 16px; gap: 12px; }
+  .footer { padding: 8px 14px 12px; }
+  .field span, .label, .sub { letter-spacing: 0.1em; }
+}
+@media (min-width: 420px) {
+  .main { padding: 20px 22px; gap: 18px; }
+  .header { padding: 18px 22px; }
+}
+
 .header {
   display: flex;
   align-items: center;
@@ -215,29 +231,33 @@ input[type="text"]:focus,
 }
 
 .page-card {
-  padding: 14px; border: 1px solid var(--border); border-radius: var(--radius);
+  padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius);
   background: #fff;
   box-shadow: 0 1px 0 rgba(255,255,255,0.8) inset;
+  min-width: 0;
 }
 .page-card .sub {
-  font-size: 9px; text-transform: uppercase; letter-spacing: 0.14em;
+  font-size: 10px; text-transform: uppercase; letter-spacing: 0.14em;
   color: var(--muted); font-weight: 700; display: block; margin-bottom: 8px;
 }
-.page-row { display: flex; gap: 10px; align-items: flex-start; min-width: 0; }
+.page-row { display: flex; gap: 12px; align-items: flex-start; min-width: 0; }
 .page-row img {
-  width: 20px; height: 20px; border-radius: 5px;
+  width: 22px; height: 22px; border-radius: 5px;
   flex-shrink: 0; margin-top: 2px;
 }
 .page-text { min-width: 0; flex: 1; }
 .page-row .title {
-  font-size: 12px; font-weight: 700; line-height: 1.45;
+  font-size: 13px; font-weight: 700; line-height: 1.45;
   display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden;
   unicode-bidi: plaintext;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 .page-row .url {
   font-size: 10px; color: var(--muted); margin-top: 4px;
   white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
   direction: ltr; text-align: left;
+  max-width: 100%;
 }
 
 .text-rtl {
@@ -255,6 +275,7 @@ input[type="text"]:focus,
   min-height: 140px;
   display: flex;
   flex-direction: column;
+  flex: 1 1 auto;
 }
 
 .selection-panel.has-text {
@@ -263,24 +284,30 @@ input[type="text"]:focus,
   box-shadow: 0 0 0 1px rgba(14, 165, 233, 0.12);
 }
 .selection-hint {
-  padding: 16px;
+  padding: 18px;
   border: 1px dashed var(--border);
   border-radius: var(--radius);
   text-align: center;
   background: #fff;
+  min-height: 120px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
 }
 .selection-hint p {
   margin: 0;
-  font-size: 11px;
+  font-size: 12px;
   color: var(--muted);
-  line-height: 1.55;
+  line-height: 1.6;
 }
 
 .selection-head {
   display: flex; align-items: center; justify-content: space-between;
-  padding: 12px 14px;
+  gap: 8px;
+  padding: 14px 16px;
   background: linear-gradient(180deg, #fff 0%, #fdfcfa 100%);
   border-bottom: 1px solid var(--border);
+  flex-wrap: wrap;
 }
 .selection-head .status {
   display: flex; align-items: center; gap: 8px;
@@ -293,24 +320,26 @@ input[type="text"]:focus,
   background: var(--paper); padding: 4px 8px; border-radius: 999px;
 }
 .selection-head .count.active { color: var(--accent); background: var(--accent-soft); }
-
 .selection-body {
-  flex: 1;
-  padding: 14px;
+  flex: 1 1 auto;
+  padding: 14px 16px;
   font-size: 13px;
-  line-height: 1.75;
+  line-height: 1.65;
   color: rgba(28, 28, 28, 0.88);
-  max-height: 220px;
+  min-height: 80px;
+  max-height: none;
   overflow-y: auto;
   unicode-bidi: plaintext;
   border-inline-start: 3px solid transparent;
+  word-break: break-word;
+  overflow-wrap: anywhere;
 }
 .selection-panel.has-text .selection-body {
   border-inline-start-color: #38bdf8;
-  padding-inline-start: 16px;
+  padding-inline-start: 18px;
   font-style: italic;
-  font-size: 12px;
-  max-height: 150px;
+  font-size: 13px;
+  min-height: 100px;
 }
 
 .pulse-dot {
@@ -328,15 +357,18 @@ input[type="text"]:focus,
 .clear-btn:hover { color: var(--ink); background: var(--paper); }
 
 .actions {
-  display: flex; flex-direction: column; gap: 10px;
-  margin-top: auto; padding-top: 6px;
+  display: flex; flex-direction: column; gap: 12px;
+  margin-top: auto; padding-top: 8px;
 }
 .btn {
-  padding: 14px 16px; border-radius: var(--radius); border: none; cursor: pointer;
-  font-weight: 700; font-size: 10px; text-transform: uppercase;
+  padding: 16px 18px; border-radius: var(--radius); border: none; cursor: pointer;
+  font-weight: 700; font-size: 12px; text-transform: uppercase;
   letter-spacing: 0.1em;
-  display: flex; align-items: center; justify-content: center; gap: 8px;
+  display: flex; align-items: center; justify-content: center; gap: 10px;
+  min-height: 48px;
   transition: transform 0.12s ease, opacity 0.12s ease, filter 0.12s ease;
+  word-break: break-word;
+  text-align: center;
 }
 .btn:active { transform: scale(0.98); }
 .btn:disabled {
@@ -361,8 +393,9 @@ input[type="text"]:focus,
 }
 .btn-secondary:hover:not(:disabled) { background: #e5e7eb; }
 .btn-sm {
-  padding: 10px 12px;
-  font-size: 10px;
+  padding: 12px 14px;
+  font-size: 11px;
+  min-height: 40px;
 }
 .btn-danger { background: var(--danger); color: #fff; }
 .btn-link.link-only {
@@ -372,8 +405,8 @@ input[type="text"]:focus,
   gap: 6px;
 }
 .btn-link {
-  background: none; border: none; color: var(--muted); font-size: 11px;
-  cursor: pointer; padding: 8px; font-weight: 500;
+  background: none; border: none; color: var(--muted); font-size: 12px;
+  cursor: pointer; padding: 10px; font-weight: 500;
 }
 .btn-link:hover { color: var(--ink); text-decoration: underline; }
 .btn-icon { width: 14px; height: 14px; display: inline-flex; }
@@ -505,3 +538,23 @@ html[dir="rtl"] .label,
 html[dir="rtl"] .sub {
   text-align: right;
 }
+
+/* Firefox sidebar : plus large que Chrome Side Panel par défaut,
+   on aère la mise en page. */
+@-moz-document url-prefix("chrome:") {
+  .shell { min-height: 100vh; }
+}
+/* Fallback : on cible aussi le web-extension panel de Firefox */
+@media (min-width: 480px) {
+  .selection-panel { min-height: 160px; }
+  .selection-body { font-size: 14px; }
+  .page-row .title { font-size: 14px; }
+}
+
+/* Très petits écrans (mobile debug, fenetres étirées) */
+@media (max-width: 320px) {
+  .brand-text { display: none; }
+  .header-right { gap: 4px; }
+  .icon-btn { width: 28px; height: 28px; }
+  .btn { padding: 14px 12px; font-size: 11px; }
+}
diff --git a/memento-note/extension/sidepanel.js b/memento-note/extension/sidepanel.js
index 716975b..e0f9511 100644
--- a/memento-note/extension/sidepanel.js
+++ b/memento-note/extension/sidepanel.js
@@ -160,18 +160,32 @@ async function getActiveTab() {
 }
 
 async function ensureContentScript(tabId) {
+  // PING initial : si le script est déjà injecté, on retourne immédiatement.
   try {
     const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
     if (resp?.ok) return true
   } catch {
-    /* inject */
+    /* pas injecté */
   }
+  // Sinon, injection manuelle via chrome.scripting.executeScript.
   try {
     await chrome.scripting.executeScript({ target: { tabId }, files: ['content.js'] })
-    return true
   } catch {
     return false
   }
+  // L'injection est async côté page : le script doit finir de s'initialiser
+  // (IIFE, listeners, flag globalThis) avant qu'on puisse lui parler.
+  // On PING avec retry pour attendre qu'il soit prêt.
+  for (let i = 0; i < 8; i++) {
+    await new Promise(r => setTimeout(r, 80 + i * 30))
+    try {
+      const resp = await chrome.tabs.sendMessage(tabId, { type: 'PING' })
+      if (resp?.ok) return true
+    } catch {
+      /* pas encore prêt */
+    }
+  }
+  return false
 }
 
 async function setPickModeOnTab(enabled) {
@@ -181,7 +195,7 @@ async function setPickModeOnTab(enabled) {
   try {
     await chrome.tabs.sendMessage(activeTabId, { type: 'SET_PICK_MODE', enabled })
   } catch {
-    /* ignore */
+    /* ignore — retry au prochain syncPickMode */
   }
 }