Revert back to old Firefox style?

Question

Soooo... Firefox updated again (to version 91.0), and it's back to the unnecessarily wide, fat ugly proton tabs it had before:

Last time they did this, you could revert back to the old style by setting the following options to false in about:config as shown below:

However after this most recent update, all these settings are still set to false, yet my browser is still stuck with this horrible design - has Mozilla now removed your ability to revert back to the old style, or is there now another new setting you have to change?

I remember Chrome did something similar a few years ago when they changed their brwoser tab style - eventually they just completely removed the option to revert back to the old style. I hope Mozilla hasn't done this now as well :(

Answer 1

This is as close as I managed to get to the original design:

It's not exactly the same, but I much prefer it!

Here's how I did it:

1. Go into about:config and set toolkit.legacyUserProfileCustomizations.stylesheets to true (if it isn't already).

2. Then, go to about:profiles, find the profile you are currently using and press "Open Folder" for the root directory:

3. In the folder you just opened, create a folder called chrome.

4. Download/copy both the userChrome.css and userContent.css files from here and place them into the folder you just created. (The files were just too big to paste here)

5. Restart firefox and your tabs should look similar to the old design!

As far as I know, there is no better way to do this, but I will update this answer if I find anything.