TL;DR: Mozilla’s translation bot on Support Mozilla (that is currently overwriting user contributions is based on the closed source, copyright infringing LLM, Google Gemini. This is in spite of Mozilla claiming that they are at the forefront of open source AI, and belies their exhortations to choose to build open source AI and data sets. Although Mozilla has experience in attracting open contributions for data sets in projects like Common Voice, Mozilla is using a closed data set to overwrite open contributions. Since (paid) Gemini queries do not train the model, Mozillians can expect to correct errors every time the bot automatically updates an article.
Time to switch to LibreWolf or something else.
Can I use that to sync passwords, history, etc. between phone and PC in some way of form, even if self-hosted?
I’ve been on librewolf for years, and as long as I’m running the FlatPak version, all Firefox extensions work. Having said that, you do have a few options to sync. One is using your Firefox account (I don’t suggest you do because of Mozilla’s BS over the past year or so, but you would be sharing way less stuff this way). In my case, the only thing I want synced in browsers is the bookmarks, so I use floccus extension in every browser, floccus app in android, and host them all in a self-hosted linkwarden instance. I hope that helps.