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youtube double sound on videos and no picture at shorts

Making moves

ONLY at 126.0.1 (64-bit) Firefox

No picture at shorts and double sound at all other videos

After set up add-ons and restart ff "synchronisation of plugins and download all script again like Tampermonkey or other" the same problem exist: no picture at shorts and double sound at all videos

Take it consideration at next firmware update


Making moves

FF Version 127.0 (64-bit)

Problem doesnt solved but at all sites no youtube video can be played with message: FF cannot open page for your security, cannot allow Firefox page preview if someone page incudeed it To see this page open a new window!