diff --git a/platform/firefox/vapi-background.js b/platform/firefox/vapi-background.js
index ab6f6eea2..014e8c3d5 100644
--- a/platform/firefox/vapi-background.js
+++ b/platform/firefox/vapi-background.js
@@ -2661,6 +2661,9 @@ vAPI.toolbarButton = {
     tbb.populatePanel = function(doc, panel) {
         panel.setAttribute('id', this.viewId);
 
+        // https://github.com/gorhill/uBlock/issues/2696
+        panel.style.setProperty('padding', '0');
+
         var iframe = doc.createElement('iframe');
         iframe.setAttribute('type', 'content');