I have a corded mouse and happens with both Firefox and Maxthon,I call it Run On.You click your mouse button but the meter races to the very right of the screen.
I know my way around the computer and use to use both mentioned browsers and they played near perfect but some thing happened to cause meter run on.So a few years ago I switched to Safari and haven't had one Run On since.
My only suggestion is to check your machine and run all updates and completely uninstall flash and reinstall.Go to adobe web page to get the uninstall program.
Try different browsers that work with your machine.