Better sync? Firefox preferences are not being synced! Save about:config modifications?

Hello Forum! Right now I’m jumping from one OS to another since I like to test different Linux distros and its very annoying having to always redo my Firefox settings about language, fonts, default search engine and others, also my about:config modifications are the most annoying ones since I always have to search each value and edit it… I like that it installs my personal addons but couldn’t it also sync the settings for them? Well at least the addons I’m using have a option to export/import settings so I’m not so bothered of them… is there an addon that will sync my Firefox settings in full? Or at least is there a export/import in JSON format or something? I don’t really want to go back to Chromium but right now it seems a better option rather than having to manually sync everything myself…