

It’s confusing because it doesn’t make sense, what is it the left/right third of? There is no feature on the controller that has any amount of sequential things. There is no identifiable “first” or anything ordered anywhere.
That’s why these buttons should be called LS, LB and LT for stick, button and trigger, which is still not perfectly intuitive without knowledge of the layout, but better than 123.
The last time I remember stuff like this happened, it was because of addon conflicts, fresh Firefox with only ublock origin “fixed it” for many people, indicating some other addon was the problem.