Rated 3 out of 5 stars
The feature in Thunderbird that allows one to search for extensions on AMO from the Add-Ons Manager breaks when Thunderbrowse is active. When I click on "Browse All Add-Ons" in the Add-On Manager, it just opens a blank tab. Also in TB10, Thunderbrowse only creates a new tab in the message display window, where in previous versions of Thunderbird it would work in a new Thunderbird tab.
I know TB10 is still in beta but I'm hoping Thunderbrowse gets updated to work properly in TB10 and above.