Good point. But then if both the script and the command have the same filename, it will be important to make sure the script has a higher precedence in the PATH. Adding it to the end of .bashrc should be enough I think.
When does it hang? If it's after you log into your user, you could try to instead when on the login screen open a shell by pressing Ctrl + Alt + F2, uninstall Nvidia drivers and install mesa drivers. Or maybe at least investigate further.
There is a Firefox fork called librewolf which addresses that.