First if you want to use Firefox on Ubuntu you will either have to stick with the Snap package which works fine after first launch or Download the .tar file from Firefox and un zip it to a folder of your choice but you will have to manually inter-grate it to the menus etc yourself. You’ll get pretty much the exact same FF either way. I don’t Believe Ubuntu going forward is going to offer the .deb file. and if you try to install a .deb file from other sources you may run into dependency problems. The .deb package in 22.04 apt repository installs the snap version of FF so in make no difference if you install either one you get the same thing. Good luck.
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