Both Celluloid and Video-Downloader are available for desktop (although V-D appears to be flatpak only, maybe…?) They seem to have different purposes, don’t they? V-D being more limited than Celluloid, from what I can see, i.e. strictly for downloading video, not for playing your stored videos. At least, that’s what I observe superficially.
I just installed the Celluloid flatpak and it looks pretty good. I’ll post some screenshots.
Edit: I remembered that I tried Celluloid months ago:
I’ll test it again now.