This can be caused by Firefox being incompatible with your graphics card drivers. To test that theory, try disabling Firefox's use of hardware acceleration for graphics and fonts.

orange Firefox button (or Tools menu) > Options > Advanced

On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"

This will take effect after you exit and restart Firefox.

Any difference?

Hello,

First you have two Shockwave Flash and Adobe Shockwave for Director Netscape installed in your computer:

• Shockwave Flash 12.0 r0
• Shockwave Flash 11.8 r800
• Adobe PDF Plug-In For Firefox and Netscape 11.0.06
• Adobe Shockwave for Director Netscape plug-in, version 11.5

So, try disable the hardwareacceleration:

Try disabling graphics hardware acceleration. Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).

Then perform these steps:

• Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
• In the Firefox options window click the Advanced tab, then select "General".
• In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
• Now, restart Firefox and see if the problems persist.

Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:

• Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

• Upgrade your graphics drivers to use hardware acceleration and WebGL

Also:

• Firefox in safe mode
• Plugin check
• Clear recent history
• Create a screenshot of the problem

Thanks for the quick response and helping me. It solved the problem. I had it to the computer repair shop for this problem, they cleaned it up and blocked some automatic updates. The problem was still there, I guess they were working with explorer or not looking for this type of problem. I just figured out that it was only on Firefox. Thanks again for watching the support forum.