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You can set these settings using a user.js file, so you don't have to reconfigure everything over and over again.

Yep, if you don't want to use Sync, user.js is an alternative. It's also helpful for sharing settings across multiple profiles. (For the latter, I do wish there was support for including other files...)

There is a user.js project on github[1] maintained by ghacks.net community members that provides a source of documentation for many settings. It's also useful as a way to monitor new and deprecated settings.

[1]: https://github.com/ghacksuserjs/ghacks-user.js

thanks for this!! Hope this will solve my main annoyance with Firefox: sometimes I change Linux distro and then I lose all of my firefox settings, ("sync" would be better and keep flags changed by the users, but I don't think that the FF devs bother about it)

Uh didn't know that, I'll have to redo my `about:config` tweaks in that format.

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