Firefox 29 is out, and it's changed a little. There's already an addon available to make it look like Firefox 28 again.
Hmmm, still working here, try doing a search for it from your 'add ons' page.Would've tried the Hide Caption Titlebar Plus, but the link gave 502 bad gateway error...
I've decided I like it (as is, without any reversion Add-ons), but those curvy tabs ain't too good - hey-ho!