I believe we only support flatpack for chromebooks.

https://support.mozilla.org/en-US/kb/run-firefox-chromeos Though besides flatpak you can also use the firefox-128.0.3.deb or firefox-128.0.3.tar.bz2 from https://archive.mozilla.org/pub/firefox/releases/128.0.3/linux-x86_64/en-US/ https://www.aboutchromebooks.com/how-to/how-to-install-firefox-on-a-chromebook-the-easy-way/ The tar is basically a archive as you just extract into a folder and run Firefox. You need to make sure the user has read/write permissions for the Firefox folder to get updates from Mozilla. Also the Chromebook needs to have a Intel or AMD CPU and not a ARM based device.