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?
with firebase it gets to know that the vault has just changed on another device, and update it immediately
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Seems like that bug report is out of date now, the url they link to only has a Microsoft crash reporting tool: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
So much FUD leveled at bitwarden lately.
why, which one is this? is this fear, uncertainty, or doubt?
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.