chore(deps): update dependency web-ext to v8.4.0

Renovate-Branch: renovate/web-ext-8.x
Change-Id: I113d7c833f9bf56d9e53077bf5ca1a532e78d1ff
diff --git a/package.json b/package.json
index 38e667e..9987451 100644
--- a/package.json
+++ b/package.json
@@ -58,7 +58,7 @@
     "ts-node": "10.9.2",
     "typescript": "5.7.3",
     "typescript-eslint": "8.23.0",
-    "web-ext": "8.3.0",
+    "web-ext": "8.4.0",
     "webpack": "5.97.1",
     "webpack-cli": "6.0.1",
     "webpack-preprocessor-loader": "1.3.0",