ff2mpv VS livemarks

It is. And you can use it in your (desktop) browser with an add-on: https://addons.mozilla.org/en-US/firefox/addon/ff2mpv/

FWIW there is a GitHub repo [0] which keeps track of currently-working ways to block Twich ads. If you don't need chat, ff2mpv [1] can be used to send streams directly to MPV by right clicking on them in the browser. This bypasses the entire proprietary Twitch frontend and displays a silent purple screen during ad breaks.

[0] https://github.com/pixeltris/TwitchAdSolutions

[1] https://addons.mozilla.org/en-US/firefox/addon/ff2mpv/

Unfortunately this won't work with the extension playwithmpv unless you modify the python server to launch a different command. I personally use ff2mpv and I modified the python code of the backend to make this change. If you are interested, this is what I changed on ff2mpv:

There are also browser extensions that add a toolbar button and a link context menu option to automatically open videos from quite a number of popular sites in MPV. I'm using ff2mpv. It only took a minute to set up.

You can use a browser extension like ff2mpv to send the urls directly from your browser (so no need to type into the terminal). This works not only in youtube but in many sites as yt-dlp has support for multiple pages.

If Firefox still uses too much CPU, then I recommend ff2mpv -- It does require changing your habits a bit, like blocking autoplay and clicking ff2mpv to launch the video in mpv when you're ready to watch, but it is well worth it.

With Firefox, use the extension ff2mpv to play anything supported by youtube-dl with mpv player.

Shout-out to the Livemarks / Foxish plugins which gives you RSS support on your Bookmarks toolbar. Still nothing better IMO for quickly browsing dozens of headlines across dozens of sites.

Firefox: https://github.com/nt1m/livemarks/

Did you file a bug report?

Livemarks should support syncing.

The thing I miss most in Firefox is the Smart Bookmarks feature they removed a while ago. Smart Bookmarks were fantastic. Add your favorite sites' RSS feeds to your bookmark toolbar and you'd have all the recent headlines from all your favorite sites at one click. Fortunately I wasn't the only one that appreciated this long neglected feature so someone created Livemarks (https://github.com/nt1m/livemarks/) that mostly replicated its functionality, but it's not quite the same as having native support for them.