Zarlin

Your package manager of choice :)

winget install firefox

No chrome (or edge) needed

Reminds me of this gem: https://lizengland.com/blog/2014/04/the-door-problem/

Had that issue too, search in Start for “Default Apps”, then scroll to the bottom and click “Choose default application by file type”. Then scroll to .pdf and choose Sumatra. The settings window may crash for some reason, but for me the file association did seem to stick after that.

Heavy stuff first, cold things together, fragile stuff last.

winget install Mozilla.Firefox

No need to even open Edge or Chrome

This can actually be caused by using mixed line endings. Which is a whole new class of horrible.

I think you mean this one?

https://xkcd.com/927/

Try syncthing, it’s cross platform and peer to peer. You can it up on a home server as well if you want.