I'm in my lists trying to update what chapter i'm on but when i click on the chapter button, it doesn't increase, The +10 and -5 buttons don't work for me either, and when i go to edit, type it in manually, i cant hit enter to confirm it or click the arrow to confirm it either. Does anyone know what the problem is and how I can fix it?
Edit: I have tried opening and closing firefox, I have tried updating in my other lists as well, I have even restarted my computer.

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Generic Manga Lover ^o^, taking all suggestions on new series.

Tried clearing your cache?
Tools > Options > Clear your recent history > select cache > clear now.
Then restart firefox.
Only mentioned it because it wasn't included in your post, if nothing works does it occur with a single series or all of them?
It's still working for me right now, and if the above doesn't help, clearing your cookie may or may not help but worth trying.
Same options as above or do it manually
Tools > Options > Remove individual cookies > Type in this site and delete them.
Then restart firefox.

Outside of those options I'm out of ideas.

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It's working now, which is weird because i reset cookies right before i went on the site in the first place lol. I reset them again and it started to work, i wonder what caused that weird bug.

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Generic Manga Lover ^o^, taking all suggestions on new series.