Votes speaks for themself
Good to see other people using Firefox have same "issue" like me and also others that like to change ability button from ctrl, shift, and.

Niclas post about locking the menu on top is only a temporary solution. Tried it one climb and didn't really like it. Guess it's something you maybe get use to but still would like the opportunity to change ability to any button to like.
Even mouse button

216 Hour Bump

Honestly I was always surprised that you couldnt change the skill buttons considering every other functioning hotkey can be switched in the settings. Ive always played on Chrome though so I hadnt had the "ALT" issue before.

380 Hour Bump

768 Hour Bump

all other key bindings are custom
agree these 3 should be aswell

432 Hour Bump

384 Hour Bump

655 Hour Bump

682 Hour Bump