I’ve recently upgraded from a dumb-phone so pardon me if this is a noob question.
So I had installed some open source apps (Firefox, VLC etc.) from the Play Store itself before I installed F-Droid. Now, F-Droid lists such apps in its Installed (Apps) section too. Is this OK? Are both the markets gonna try and update such apps and possibly cause conflicts? Is there a way I can prevent F-Droid from checking updates for such apps and letting only Play Store handle them?
That is a pretty common scenario. Normally, you wouldn’t have to do anything, because:
F-Droid can’t automatically install updates, as it does not come with your phone from the factory.
Even when you manually install each update through F-Droid, the Android system won’t allow it, due to application’s mismatched certificate of origin. (Exception in this case is Firefox)
F-Droid won’t download application updates by default (unless you actually configured it to do so).
Due to these facts (especially the first point), F-Droid won’t interfere with software which you originally installed via Google Play, including Firefox; unless you explicitly asked it to and walk through manual process for each application.
But like @krt recommended, you can explicitly make F-Droid ignore them, by searching these applications inside F-Droid, open the application’s information page, tap menu button, then check “Ignore All Updates”; so that F-Droid won’t list or try to automatically download update for that certain application.
Two downsides of not explicitly ignore those updates are:
These applications could pollute your “Updates” list inside F-Droid, even you can’t really install those updates.
If you manually enabled “Automatically download updates” setting in F-Droid, bandwidth and storage space might be wasted on downloading non-installable updates for those application.