So Google Chrome stopped working entirely for me for some reason so I'm switching to Firefox because there is no way in ever that I'm using IE. So of course, I go to Subeta to log in, and while it does get me past the login screen, when I try to go to pets/inventory, it goes back to the login screen. Also, right after I "log in", and it takes me to the news page, it doesn't load the custom CSS layout I have for the website, like it does when I log in on IE or Chrome. I logged out of Subeta on IE and then back in again to make sure my password is right, and it is. It just... doesn't let me log in. Is there any particular reason for this?
I'm having the same problem. Edit: I cleared my entire browsing history and that seemed to do the trick... but as I've only had Firefox installed for ~15 minutes, I don't know if that was what solved the problem or if it was just persistence on my part.

Try clearing your browser's cache and browsing cookies. Let me know if that works for you or not.
Is it letting you log in through Firefox now?
yes! sorry for never getting back to you. the first time i cleared everything it didn't work, but it started working for no particular reason about a week afterwards.