@Huktamatyi What extensions do you use for this on desktop? If they are adblock-style list based, maybe those lists could be imported into vivaldi.

@MOHDAHMEDKHAN27052003 This sounds like a bug, rather than a missing feature. If you can provide more details, it might help figure out why this is not working.

btw, background playback is still possible through the desktop version of Youtube
https://www.macrumors.com/how-to/keep-youtube-playing-in-background-on-iphone/

Upvoted. But there are some things to consider.
When I use the default settings and mute a tab, then sure, I want the Unmute button to always be visible even when the tab doesn't play any sound. But I have changed the site permissions for some websites and set the sound permission to "Block" (e.g. some sites with an annoying support chat that plays a notification sound when you open the page). For them I don't want the Muted Speaker icon to always be visible. So I think this should only apply to tabs that have been manually muted.

If you have a middle mouse button, panning of large images is excellent.