> Gone are the bulky angles and edges of tabs and menus. In Firefox 29, you’ll see streamlined, almost aerodynamic, curves giving emphasis to your current tab and subtly understating the rest.
5 years after Google Chrome introduced them [rounded tabs]
Horizontal tabs are so 2007. ;-) I'm still waiting for Chrome to have a vertical tabs solution that's as good as Tree Style Tab for Firefox. Tabs Outliner and other Chrome extensions are inadequate.
1. Aping chrome
2. Not having any option to restore sensible tab styles without an addon
3. The general 'fuck the users' mentality they have developer recently
4. Hostility to undoing the damage via removing as many customisable elements as they can.
5 years after Google Chrome introduced them [rounded tabs]