This is my userChrome.css file to correct the tab issue you describe: https://pastebin.com/5PrwSD5k https://pastebin.com/5PrwSD5k. More tweaks can be found at h

This is my userChrome.css file to correct the tab issue you describe: https://pastebin.com/5PrwSD5k https://pastebin.com/5PrwSD5k. More tweaks can be found at https://github.com/piroor/treestyletab/wiki/Code-snippets-for-custom-style-rules https://github.com/piroor/treestyletab/wiki/Code-snippets-fo.... I agree that I'm very disappointed with the transition to Web Extensions. In addition to the items you mentioned, Vimium can no longer be used while on a built-in page such as the about: pages or the start page. This is really frustrating since it requires different commands depending on context and leads to breaks in my flow. I am hopeful that over time we will see an expansion of the current API to include a lot of the functionality that we are currently missing, but Firefox may never achieve the same level of useability that it has had until this point.