Firefox introducing tabs instantly made it more usable than IE. Then Chrome came out, and was always two steps ahead of Firefox. A month ago or so I added Firefox support for 90s.dev but for some reason they still don't support ES modules in service workers, which was a pain to work around (see https://github.com/sdegutis/os.90s.dev/blob/main/main.ts#L12... and https://github.com/sdegutis/os.90s.dev/blob/main/site/sw.ts#... )