Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Full changes: https://github.com/gavinsharp/tabcloser/compare/a3c5885480b2277188df31bfab5c4ac2903c7d9f...master
Only one minor change to fix the context menu, which was broken by the landing of https://bugzilla.mozilla.org/show_bug.cgi?id=347930 on the trunk.
Detailed list of changes: http://hg.mozilla.org/users/gsharp_mozilla.com/tabcloser/pushloghtml?fromchange=e62fb09006d8&tochange=3b5a6ceb7e0f