Set as follows while using vcpkg for install gtk vcpkg.

Sidebar
behind!
darkreader
multi-containers
ublock
whitelists youtube ublock
Youtube Timestamps

at about:config

Firefox Hello (off)

loop.enable => false

Pocket (off)

extensions.pocket.enabled => false

Enable cointainer Tab ( Multiple account in one Browser Win)

privacy.userContext.enabled => true	

for more tweaks see also https://privacytools.io