Vivaldi is a no go, it is proprietary software and also based in chromium. I've had similar thought process to yours and I am also using Floorp. Librewolf is great but too privacy hardened for the common lay user. These forks are cleaning the s*** out of firefox so no need to worry.
geoma
There is no writren record nor recordings (of course) of such ancient music. Yes, there are some hints like greek musical modes but they are not trustable in terms of historicity. You could guess greek folk music has a relationship with this ancient music and speculate a little based on archaelogical evidence of instruments, but: nobody knows how roman or greek ancient music sounded.
Newpipe or grayjay on mobile. Freetube on desktop.
To enable gesture typing, download Google's gesture typing library at https://github.com/erkserkserks/openboard/tree/master/app/src/main/jniLibs/arm64-v8a and then import it by opening the OpenBoard settings app, going to "Advanced", and then choosing "Load gesture typing library". Note: Google's library is proprietary and not open source.
I use it with many languages. I even swipe in spanish
Its working completely offline? You might want to add it here https://appdb.winehq.org/objectManager.php?sClass=application&iId=1815
Just go osm.org and help spread the word
Yes... Why META?
https://hubzilla.org is a a powerful fediverse platform that includes wiki functionality
https://js.wiki is a great wiki software