Well, that was quite an adventure to log back in.
First of all, my login mail was on lolcow.email, which is still held hostage by cloudflare. Thankfully, they kept the MX records, one of which I added in hosts to access the site directly. Even then, I couldn't just go there, the browser was throwing NS_ERROR_NET_INADEQUATE_SECURITY; turns out I had to disable HTTP/2 as well (network.http.http2.enabled in about

onfig). After that I just added a certificate exception, logged in and finally got my reset link.
Or so I thought. Not sure if the link itself worked or not, but Tor mirror definely is malfunctioning thanks to Upgrade-Insecure-Request headers redirecting everything to nonexistant HTTPS. I think I somehow managed to reset it by changing requests in devtools, but then I still couldn't log in, even going back to clearnet, first attempt throws a captcha, and on second one I'm just greeted with ERR_EMPTY_RESPONSE. Well then, I've requested the password change again, and this time it worked without any hassle. Tor mirror still isn't working as intended, but I've set up local proxy that hides that damn header and it's usable now. Can't log in thanks to recaptcha complaining about wrong host, but transplanting cookies from clearnet worked.