It appears that the only way to make settings selections is to return browser.proton.enabled to true. Of course now I am back to the awful new design that makes it hard to see the tab bar. Whoever made these changes, needs to understand to important things: 1. Modern sleek looking design DOES NOT EQUAL functional design 2. Just because you can doesn't mean you should

You can address the color/contrast issue using an add-on theme, for example:

• https://addons.mozilla.org/firefox/addon/photon-colors/
• https://addons.mozilla.org/firefox/addon/classic-system-theme/

Themes cannot add separators between the tabs. To do that, you would need to use the community-supported (unofficial) workaround of a userChrome.css file.

In case that is all new to you...

You can set Firefox to look for a style sheet file at startup that overrides the built-in styles of the toolbar area, menus, and various other things. I have a site about what it can do and how to set it up, with a specific section on restyling the tabs:

• https://www.userchrome.org/
• https://www.userchrome.org/firefox-89-styling-proton-ui.html#tabstyler

If you're interested in trying that, I or another support volunteer can lay out the steps in more detail.