Hi,

You can try deselecting Use hardware acceleration when available in Tools > Options > Advanced > General.

Updating system graphics drivers

Troubleshooting

Turning off hardware acceleration in Mozilla Firefox seems to have fixed it the menu remnant portion. With hardware acceleration turned off, Youtube videos stop playing. There is no indication that Youtube is downloading the data or the processing circle which appears in the middle of a video when it is held up because of a server latency problem. Turning hardware acceleration back on alleviates the Youtube video problem but of course recreates the pull down menu problem.

You can try to Clear Now the Cache, and Cookies via Tools (Alt + T) > Clear recent history. Please also see this.

Options

Try to "disable the hardware acceleration" in the Flash Player.

• http://helpx.adobe.com/flash-player/kb/video-playback-issues.html

See also:

• https://support.mozilla.org/kb/keep-flash-up-to-date-and-troubleshoot-problems

Flash "Display settings" window:

• http://www.macromedia.com/support/documentation/en/flashplayer/help/help01.html