Rated 3 out of 5 stars
The ` key has stopped working with the latest version (v0.2.19) on TB 220.127.116.11. I cant seem to post to the mailing list as well.
Otherwise great extension!
Bug fixed in the development version
The bug you mention is fixed in the development version, which is pending for approval on addons.mozilla.org.
As for the mailing list, you need to be subscribed to it in order to be able to post. The google group is just a read-only mirror of the list; you cannot post through it.