Change this gray color in the popup in about:preferences in import data from another browser
Vertical tabs on right
There is a way to make visible like normal tab the Firefox-view tab?
multi-row_tabs_below_content and fake_statusbar_w_bookmarks_bar don't play nice
Change the color of this separators in about:preferences in the translation section?
Fix the position of the hamburger menu when shrinking the window?
Code indentation and notes on what each piece of code do?
Is it possible to change this gray border in the print screen?
Curved tabs project, overflow issues
How can I change this image when first opening Firefox?
How can I change the background color when dragging an item in the sidebar menu?
Hide one of a double separator using userchrome.css
distinguish between themes that use one image and the themes that use 2 or 3?
Gone is the way to distinguish between Windows versions.
Change the color of this gray background and the color of the loading icon in the print screen