Can others here verify if the bug exists for them? I just updated Firefox again and now I get different textarea behavior: 1. BROKEN: textarea in a Disqus comm

Can others here verify if the bug exists for them? I just updated Firefox again and now I get different textarea behavior: 1. BROKEN: textarea in a Disqus comment editor (as suggested by a comment on the bugtracker). Cmd-left and Cmd-right go back and forward in browser history, unless there is no history in that direction, in which case they go the the beginning and end of the line. 2. BROKEN: gmail compose textarea. Cmd-left and Cmd-right do nothing at all. 3. WORKING: textarea for Hacker News commenting. Cmd-left and Cmd-right work as expected, moving to the beginning and end of the line regardless of browser history.