Someone just created a new theme for Mozilla’s Firefox browser that essentially turns it into something similar or an alternate version of Microsoft’s Edge browser. This theme features both light and dark Edge themes and can be installed via the Sylish Firefox add-on or by a more direct approach, which requires the downloading and editing of files from the GitHub page.
Here’s how they described the theme:
Firefox Edge is a theme for Mozilla Firefox that closely replicates the look of Microsoft Edge (both light & dark themes) without losing any features of Firefox. The theme is applied only to the top level visuals, meaning that context, popup etc. menus will keep their default look. Firefox Edge has been tested on Windows 10 and Firefox 50.