Ah it looks so clean and dense, love it. So much better than what is proposed to be changed into. At least we can make adjustments with custom CSS. Mine matches the system theme (from the operating system) BTW. :-)

Ah that's a good one too. I like the tabs. After my postings, I did some changes since then. Will do some further adjustments to the tabs. Iike its taking the full height of the tab row. The main thing I changed is having only one Bookmark folder in Bookmarks Toolbar, and put it in the same line as the tabs as a menu.

The color scheme, more dense and compact styles, non floating tabs, less rounded, and here and there stuff. I even changed something after posting. Being able to make changes to the UI with custom CSS is amazing on Firefox.