Both are usable but not optimised and not currently a particularly good experience. My experience is based on Mobian on Pinephone but it should be pretty much the same on the L5.
Bitwarden desktop electron can be installed from flathub and runs. It’s pretty slow and clunky though and electron apps in general display slightly blurred (if they run at all). So it’s possible to open it and copy a password from it but if you’re expecting the Android/iOS autofill experience you’ll be disappointed.
Jellyfin works via MPV shim (https://github.com/iwalton3/jellyfin-mpv-shim) or web browser. In both cases performance isn’t really good enough to make this suitable for daily use either, both in terms of scrolling around the interface and in terms of video playback but this may be better on the L5 than the PP given it’s better GPU.
I did experience a freeze when trying to open the .png from Okular’s File menu. I was able to open the .png from Nemo, though.
Edit: The freeze happened when, from Okular’s File menu, I was attempting to open Pictures directory to get a .png. I mistakenly tried “Open” to enter the Pictures directory. I think Okular was instead trying to open that directory as the viewed file. The correct way would have been for me to first double-tap Pictures, then Open the .png.
Also, once a file is opened for viewing in Okular, the File menu stays grayed out, so you can’t close the document or the app. It’s corrected by minimizing the app, then maximizing. Still usable, though.
okular is so old from the amber repos. It is version 1.2.3 or something like this when the current version is 20.12.3. Why it is so old…? This is one of the reasons I had to move my L13 from amber to byzantium, but I do not want to do this on L5.
Okular is a needed pdf viewer because it is the only one that can check digital signatures with ease. The flatpak version seems that needs a lot of space (or I misread the information it gives before confirmation?)
So from the ice ages that okular was in version 1 until now that it is in version 20 there has been no Debian stable release? This is hard to believe. Something must be very wrong with okular in Debian.