Rated 5 out of 5 stars

Works very nicely
If you can't install the latest version with TB8, first download it manually from it's homepage (in this case it's firetray-0.3.4.xpi). Then go to the addons tab on TB, click the tools icon, "Install from file". Look for it. It'll work fine :)

This review is for a previous version of the add-on (0.3.3).