We use HockeyApp for crash reporting and Firebase messaging for push notifications to keep your vault in sync. If you don't want those features, you can use the F-Droid build.
Explanation, just so everyone doesn't think they're included just for fun
this post was submitted on 05 Jan 2025
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Bitwarden
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My fdroid version also syncs, then why use firebase for pushing notifications?
you are right, but you'd think a privacy focused open source password manager wouldn't connect to big corps in the background
6 years old bug report?
Seems like that bug report is out of date now, the url they link to only has a Microsoft crash reporting tool:
https://reports.exodus-privacy.eu.org/en/reports/com.x8bit.bitwarden/latest/
I searched fdroid and didn't find it.
Get this warning 
That's F-Droid's generic warning about third party stuff. It's Bitwarden's repo, not F-Droid's.
Somewhat adjacent, but this doesn't surpise me since when watching network traffic from "private" or "analytics-removed" forks of FOSS projects they still tend to ping a dozen servers on start up. Not saying all, Keepass for instance is a good example
I use Bitwarden app from their f-droid repo. I also use Rethink DNS app that manages all the DNS queries. I have never seen it connect to any Google or Firebase domains. But, I host my own Vaultwarden, maybe that's why?
You could at least have read the 2nd comment on the issue, the f-droid app has no crash reporting and does not use Google Firebase for sync updates.