Probably not. OTOH, you can put the changes into a file called 'user.js'. Go to the folder of the FF profile you're using. Backup the file 'prefs.js' to restore

Probably not. OTOH, you can put the changes into a file called 'user.js'. Go to the folder of the FF profile you're using. Backup the file 'prefs.js' to restore in case you don't like the result. Then drop 'user.js' into that folder and restart. When you're sure you're happy with the changes, then you can just drop 'user.js' into the profile folder(s) on your other machines. The process is detailed here. https://www.ghacks.net/2015/08/18/a-comprehensive-list-of-firefox-privacy-and-security-settings/ https://www.ghacks.net/2015/08/18/a-comprehensive-list-of-fi... Edit: I haven't personally tested this past FF59.