it happened with me also earlier time does you mouse red light is working if not it has a problem in the circuit and does your mouse have a problem in clicking , if it has then its click button has a problem and you have to buy a new mouse or wire has been cut off from inside the plastic wire.
@FutureAstronomer is it possible, that you have the multi premoves extension activated? Then you are not able to move in general. If you can still play on a trackpad, then I have absolutely no clue what you can do :(
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