How trustworthy is Mozilla Firefox with user accounts and data?
I want to sync things between 2 computers and apparently the only way to do this is to login to Firefox. Preferably I want to avoid tracking and stuff but sometimes it’s just a bit inconvenient. Is Mozilla trustworthy in terms of privacy with logging in, like data sales, especially data breach with passwords?
Mozilla doesn't sell your data, and I've never heard any news about Firefox Sync having a breach, your data is safe from attackers and Mozilla themselves with Sync.
The data is encrypted, so not even Mozilla can see the data you sync, and Mozilla is also generally pretty trustworthy, so in terms of privacy, its fine.
For passwords, its probably not as secure as trusted dedicated password managers like Bitwarden. I just use Firefox for syncing bookmarks and sometimes tabs, and Bitwarden for passwords and things like that.
I've not tried it but looks doable but probably need a degree of familiarity with both web hosting and linux based systems to trouble shoot, and you need to run both Sync and Accounts to authenticate it.
Personally I do trust Firefox with my browsing data and syncing so use their service.
They don't sell your usage data or anything like that, but I still don't trust a browser to save things like passwords. There are better, more secure options for that sort of thing.