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

• On June 3rd, Chrome(ium) users will start being informed that their MV2 extensions will soon stop to function. uBlock Origin (and others) will lose the “Featured” badge.
• The remaining MV2 extensions will be gradually disabled in the “coming months”, with the last deadline being the beginning of next year. (Expect that uBO will probably not last that long).

What options do you have if you still want to use uBlock Origin?

• Firefox (and up to date forks) have no plans to end support for the webrequest API that uBO requires.
• Brave browser will allow MV2 extensions for now. I still have no info on if they are going to use their own store or require manual installation/updating of MV2 extensions.
• If you use Chrome. By enabling enterprise policy ExtensionManifestV2Availability, you should be able to extend support till June 2025.
• uBlock Origin Lite (uBOL) is a MV3 extension that is much more limited than uBO and is not intended to be a replacement for uBO. These limitations are described in detail in the FAQ for uBOL: https://github.com/uBlockOrigin/uBOL-home/wiki/Frequently-asked-questions-(FAQ)

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.

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.

Sandbox your browser in a VM or something. Don’t use the same browser/VM for banking/personal stuff and everyday browsing. Most browsers should work. (Except Chrome/Edge/Opera/Yandex). Personally I prefer Firefox. LibreWolf can also be an option, but you have to opt-in to see videos with DRM etc. Tor is also an option, but the downsides are captchas and websites that block you.

If you’re even more extreme you can also use uBlock Origin in “hard mode” and the no script toggle. That will block JavaScript and prevent websites from connecting to any 3rd parties, anything from tracking servers to CDNs. That will definitely break websites, so you’ll have to know how to unbreak them, which can be quite the learning curve for some people.

Why not Chrome/Edge/Opera/Yandex you say? Chrome is owned by an advertising company. Edge tracks you plenty. Opera and Yandex are made by companies from authoritarian states.