diff --git a/userscript/manga-bookmark.user.js b/userscript/manga-bookmark.user.js
index 97aaaa9..ba21e96 100644
--- a/userscript/manga-bookmark.user.js
+++ b/userscript/manga-bookmark.user.js
@@ -1048,6 +1048,12 @@
       reset();
       if (didDrag) snapToEdge(); // OS claimed the gesture mid-drag — don't strand the FAB
     });
+
+    // touch-action: none stops panning and zooming but NOT Chromium's long-press
+    // gesture, which fires at ~500ms — just after ARM_MS — raises the context
+    // menu, and cancels the pointer stream. The hold armed the drag and the OS
+    // stole it back a frame later. Suppressing the menu keeps the pointer alive.
+    fab.addEventListener("contextmenu", (e) => e.preventDefault());
   }
 
   // ============================================================
@@ -1403,7 +1409,7 @@
       border-radius: 4px 0 0 4px;
       background: #6d28d9; opacity: .45;
       box-shadow: 0 2px 8px rgba(0,0,0,.4); z-index: 2147483646; cursor: pointer;
-      touch-action: none; user-select: none;
+      touch-action: none; user-select: none; -webkit-touch-callout: none;
     }
     #fab.left { border-radius: 0 4px 4px 0; }
     #fab:active, #fab.armed { opacity: 1; }