Any time I Middle click on an empty space on a Web page to quickly scroll up/down or side/side, the screen displays Middle buttons around 300 on the screen.

I have a logitech mouse mouse 500 X

Try turning off hardware acceleration.

  • Tools > Options > advanced > General > Browsing: "use hardware acceleration when available.

If disable hardware acceleration works then check if there is an update available for your graphics display driver.

Tags: Firefox

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