Recently, maybe after the update of 2026-08-25, when I open openrouter.ai site, an error occurred: Application error: a client-side exception has occurred (see the browser console for more information).

It works great but lacks conditional permissions, i.e., it cannot be loaded on click or only on specific domains. This is a limitation with Firefox’ handling of all Manifest v2 add-ons, so the plugin must be updated to Manifest v3 to give us the same privacy controls as it already does in Chromium based browsers.