Do you use Tab Mix Plus? I do. It is set for tab widths of 250 to 500 by default. FF 29 made the tabs very wide. I reduced the lower limit from 250 to 500 to 100 to 100 to 500. It doesn't fix the square tabs, but it fixes the wide tabs. I am using CT 23.5, Windows 8.1 on a PC. BTW, do not use Classic Theme Restorer. It has a tab color function that colors tab selected, read, unread, etc, but will not color all the tabs at random or by domain. It conflicts with colorful tabs and the function cannot be turned off. I restored the Add On Bar with The AddOn Bar (restored) 3.1 and put the tabs below the address/Awesome bar with Tabs on Botton (Australis) 0.3. It looks like we are on our own with regards to how FF 29 looks, at least until the people at Mozilla come to their senses and admit they screwed up. I have been using Pale Moon since Tuesday. Maybe FF will fix this abomination when they drop below 3rd most use browser to 4th or 5th and drop from 17.6% of the browser market to below 15%....