Are you mixing it up with Firefox Focus? Because that one is very minimal in features and ui by design. The normal Firefox for Android has had tabs, extensions and otherwise been a fully usable mobile browser for years

I am from Denmark where the biking infrastructure is also pretty good, so I will almost always take the bike if I'm going somewhere that is further than 1 km away (~.6 miles).

But that is just if I'm going somewhere -- taking a 4 km walk just for the sake of the walk and getting some fresh air (especially when the weather is nice) is quite normal here.

Zoho works well for me with my own domain (though I am on the old free plan that allows IMAP, while today the free plan only supports webmail or their own app). I also know someone who uses Tuta without problems sending to Google and Microsoft.

Which parts of computer science are you interested in? I would suggest looking at some different universities' current fields of research to find one with a focus that aligns with your academic profile.

You can use this as a starting point in your search, as it has sorting options based on topic https://edurank.org/cs/eu/