I just patched my Firefox to disallow this annoying behaviour. On OS X, unfortunately, but the patch should be similar on Windows, although the paths will differ. Used Midnight Commander to edit inside omni.ja, which is a plain Zip archive.
** Attachment added: "firefox_close_other_tabs.png" https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1064985/+attachment/3410459/+files/firefox_close_other_tabs.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1064985 Title: Firefox 16. Warning about close multiple tabs is always on To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/1064985/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs