diff --git a/plugins/CHANGELOG.md b/plugins/CHANGELOG.md
index 35edd55869..5c1e07dd74 100644
--- a/plugins/CHANGELOG.md
+++ b/plugins/CHANGELOG.md
@@ -14,6 +14,7 @@
 - **plugins-runtime**: `Library.createComponent()` now rejects invalid input (an empty shape list, or a shape inside a component copy) with a validation error instead of returning a component proxy pointing at nothing.
 - **plugins-runtime**: Setting an individual padding/margin side (`leftPadding`, `topMargin`, …) now re-derives the padding/margin type, switching to `multiple` when the four sides stop being symmetric (so the value is actually painted) and back to `simple` once top/bottom and left/right are mirrored again.
 - **plugins-runtime**: Removed the premature deep-hardening of the host plugin context, which froze shared host functions (including `Function.prototype`) before SES override taming, causing `TypeError: Cannot assign to read only property 'toString'` on later host-side function extension. Related to #11001.
+- **plugins-runtime**: The plugin modal no longer shows two resize grips in Firefox. Firefox now shows only its native grip. Closes #11795.
 - **plugins-runtime**: Fixed the `fontFamilies` token property mapping so `Shape.applyToken(token, ["fontFamilies"])` resolves to the canonical `:font-family` attribute and applied-token readback exposes the documented `fontFamilies` key instead of the undocumented singular `fontFamily`. Closes #11405.
 
 ## 1.5.0 (2026-07-08)
diff --git a/plugins/libs/plugins-runtime/src/lib/modal/plugin.modal.css b/plugins/libs/plugins-runtime/src/lib/modal/plugin.modal.css
index bd987442d2..8714c06eff 100644
--- a/plugins/libs/plugins-runtime/src/lib/modal/plugin.modal.css
+++ b/plugins/libs/plugins-runtime/src/lib/modal/plugin.modal.css
@@ -29,6 +29,13 @@
   display: none;
 }
 
+/* Firefox cannot hide its native resize grip, so show only that one. */
+@supports (-moz-appearance: none) {
+  .wrapper:after {
+    display: none;
+  }
+}
+
 .wrapper {
   position: absolute;
   inset-block-start: var(--modal-block-start);