So, once again Firefox automatically updated on me, and my tabs moved.... again. Used Classic Theme Restorer which was a good resource. But it doesn't work with Firefox Quantum, and the about:config tabs.on.bottom option seems to now be missing. I managed to find a CSS solution, and with struggle, I managed to move the tabs back where they belong, on the bottom. Annoyingly, this brought the transparency with it, and I can't find a CSS solution to it. I don't mind the menu bar being transparent. In fact, I kind of like it. I don't like there being a second horizontal transparent bar on my browser. How do I remove the tab bar transparency only?

I'd also be really happy if I didn't have to fight to get Firefox back to the way I like it every time there's a huge update. If there were a customize option native to Firefox, that would make me less likely to switch to Opera out of frustration.