diff --git a/src/package.json b/src/package.json
index ed12f4b..cc64dee 100644
--- a/src/package.json
+++ b/src/package.json
@@ -61,7 +61,8 @@
   },
   "main": "index.js",
   "permissions": {
-    "private-browsing": true
+    "private-browsing": true,
+    "multiprocess": true
   },
   "preferences-branch": "extensions.tabscroll",
   "preferences": [