I have been using this for years, and I was delighted when the author took the time to rewrite the extension to work with newer Firefox versions, and with Chromium browsers too! Well done! It also works with Firefox Sync (go its settings to enable that). The settings are a bit hard to understand at first, but there many more settings than anything else that I've tried.

The only thing that it lacks is that the settings page is not suitable for small screens on Firefox for Android.

This is the first browser extension that I have ever donated to.