- I use Sidebery for tabs, and have disabled the horizontal tab panel on the top using oldschool userChrome.css file. - I use the dark theme. However, that mak

- I use Sidebery for tabs, and have disabled the horizontal tab panel on the top using oldschool userChrome.css file. - I use the dark theme. However, that makes lots of pages use dark theme as well, so I've changed layout.css.prefers-color-scheme.content-override in about:config to not follow my theme, but my OS settings. (So I can have dark themed web pages during evening, but not all the time) - And I use containers a lot. Very well integrated with Sidebery I feel.