I've been using FF 89 for a few days now, and other than tabs-on-bottom getting broken by the update, my only - but major - complaint is that the new "tabs" suck. They don't look like tabs any more, just a bunch of buttons on a bar.

Not only don't the "tabs" look like tabs anymore, it's also very difficult to tell which one is actually selected, which can be very annoying depending on how you use tabs.

How is a bunch of page-select buttons on a bar an improvement on a design where they actually look like tabs?

Edit: Actually, the lack of visual feedback on which "tab bar" button corresponds to the current page (i.e is the current tab) is likely annoying for most users, since you need to know in order to close that tab rather than some other one by mistake. Best bet to be sure is to click on the tab button you think is the current one, to reselect it, before clicking again on the "x" to close it.