It seems so easy to reproduce, just install Lubuntu and run the Twitch dashboard for a few hours. I'd be surprised if there wasn't already a bug report, a cursory search of bugzilla shows several hundred bugs containing the words like "hang" and "freeze".
And, again being frank, I don't care enough to bother with scouring that for one that seems related enough to add to it, and then again reproducing the problem and collecting the appropriate logs and etc. And if experience is any indicator it'll just languish in their bug database for months or years anyway. I've got shit to do man, so I'll just use a product that works, thanks. It is not my responsibility to fix yours.
And I only brought it up because someone mentioned how much "better" a product Firefox is and my experience differed.