I’m on Linux with Firefox and have never had that issue before (particularly nexusmods which I use regularly). Something else is probably wrong with your setup.

There are migration tools, but not a good bulk one that I could find. It worked for my repos except for my unreal engine fork.

Why do your th’s look like that?

If you were really worried you could even install with steam in offline mode I believe.

May I introduce you to the wonderful japanese ads on the toilet?

Every month xcode updates and breaks everything. Every two years I have to cycle a million certs that have different names depending on what apple docs your are looking at. Apple is pain