Thursday, June 03, 2021 Firefox 89 has a new appearance, removing features (ugh) and annoying some people while delighting others. It can be disabled by setting browser.proton.enabled to false: Firefox 89 with Proton disabled I mostly like the new design though, but I strongly dislike some elements, especially the tabs: Firefox 89 tab appearance I want the active tab to be much brighter. I couldn't see a way to set the color in Firefox Color. In Firefox Color, use the Advanced Colors / Tab Selected setting. Thanks to an anonymous commenter for this tip. The inactive tabs blend into the background. I want to see distinct tabs.