I think I also had this issue using Cinnamon once, but then I just used VLC instead. Never bothered to look into why. Worked fine in GNOME for me though.
I found a thread with a similar issue: https://forums.opensuse.org/t/flatpak-mpv-broken-since-20240306-snapshot/172981
There it seems the issue was audio. Try running the flatpak version with flatpak run io.mpv.Mpv --ao=pulse path-to-your-media-file
What options do you have if you still want to use uBlock Origin?
For the flatpak version the mpv.conf file can be created in ~/.var/app/io.mpv.Mpv/config/mpv/. You probably don't need to link it to the yt-dlp python file as the flatpak mpv version should come with the latest yt-dlp.
Mint is known to use old software in its repositories as it's based on Ubuntu LTS. The flatpak mpv should work though. flatpak install flathub io.mpv.Mpv and then run it with flatpak run io.mpv.Mpv https://www.youtube.com/watch?v=dQw4w9WgXcQ
If you don't want to type flatpak run io.mpv.Mpv all the time, you can create an alias in your ~/.bashrc file. For example: alias play='flatpak run io.mpv.Mpv'. (After editing your bashrc file, run: source ~/.bashrc to activate the change). Then you can run it with play https://www.youtube.com/watch?v=dQw4w9WgXcQ.
Your mpv or vlc versions may be too old. Try updating them to the latest versions.
Sounds like a bug in the filters used by Adblock and Adblock Plus. Afaik uBO or Adguard aren't affected.
OpenSUSE use patterns. Groups of packages that can be selected during installation. If one of the included pattern packages is removed it will be "fixed" when updating. You can uninstall some patterns, but be careful as some may be more important than others, leaving you without a graphical interface or something like that. If you decide to do a reinstall, you can deselect a lot of patterns (search for "pattern" in the software selection section of the installer).
Is there an equivalent or something similar to "Use host i/o cache" that VirtualBox have? Last time I tried virt-manager the install time of the vm was incredibly slow because of the terrible write speed to my hdd. Vbox fixes that issue with the host i/o cache setting.
Just Firefox/Librewolf with uBlock Origin is enough. The more extensions you add, the larger the attack surface and chance of site breakage. A common mistake many do is to add multiple blockers on top of uBO which will decrease uBO's ability to defuse various anti-adblocks. This also includes addons like Privacy Badger, Ghostery, DuckDuckGo Privacy Essentials, etc. uBO have good enough privacy protection enabled by default. If you want more, enable some other privacy filter lists. And if you know what you're doing, enable hard mode by blocking all 3rd party requests and JavaScript.
If you want to feel more secure when adding more extensions to your browser, then only use Firefox addons that are recommended by Mozilla. Those extensions have gone through a review process to make sure they don't contain anything malicious.
If you're like me and don't care about recommendations and being able to comment, then use Freetube with sponsorblock enabled.
The performance issues are because of Adblock and Adblock Plus: https://nitter.net/gorhill/status/1746263759495077919#m
It affects more sites than just YouTube.
You shouldn't have to install any flatpak dependency manually. Flatpak should handle it for you automatically when you install your programs. (In most cases.)