[PM-10730] Override FireFox extension styles for text alignment (#10528)

* override firefox extension styles for text alignment

* remove CSS override

* turn off browser specific sidebar styles

- which solves the text-alignment issue in FF

apps/browser/src/manifest.json

@@ -134,7 +134,8 @@
   "sidebar_action": {
     "default_title": "Bitwarden",
     "default_panel": "popup/index.html?uilocation=sidebar",
-    "default_icon": "images/icon19.png"
+    "default_icon": "images/icon19.png",
+    "browser_style": false
   },
   "storage": {
     "managed_schema": "managed_schema.json"