Learned that one of the values you can use with "font-family" is "cursive". Whatever font this gives you on android looks as you'd expect, but firefox and/or linux interprets this as... comic sans?? 
Looks like it's the same on mine. What a bizarre series of decisions. like... why have comic sans at all, why define it as "cursive", why not include the other two 
@matt this is on my website homepage. i wanted the comic sans actually, but some browsers just make my website fancy cursive for no reason
@xyzzy Ah yeah, I get comic sans on my computer but cursive on my phone
Your CSS has {font-family:"Comic Sans MS", Comic Sans, Cursive;} it's falling back to cursive because it doesn't have comic sans. I don't know how to find out what fonts android uses, but changing it from cursive to "casual" might get you better results
@matt tysm i’ll try it! “cursive” was suggested as the fallback when i was looking up css font resources years ago when i made this page but i probably should just use something else bc i’m not here for my website looking like a wedding invitation
@matt also i just realized this means you looked at my absurdly jank webpage source lmao i am so sorry
@xyzzy Haha I promise it's no worse than mine, my CSS is always a disaster
@matt i feel like i never actually learned css, i just find code bits on the internet, smash them together, and pray,
The decision of what "cursive" means comes down to a thing called fontconfig. If you look in /etc/fonts/conf.d you'll see a ton of files loaded in a hierarchy with XML trees defining "families". When a family is called, the systems tries font by font defined here and uses the first match it finds.
Comic Sans is font No 3 in my config, after two others I know are not installed.