Adds a new opt-in dialog to for "Firefox consent experience". No other changes.

Improve handling of Bing search results.

Refreshed to keep up with changes in search engines.

- Recognizes and can remove more Google ad formats.
- Recognizes and can remove Bing ads.
- Removed support for defunct search engines Bleeko and Iseek.

The WebExtension version, as required by changes to Firefox. Same ad limiting you all know and love.