Hello,

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

Did this fix your problems? Please report back to us!

Thank you.

We have received many reports on this issue. You are not the only one. Try the method above, and report back if it worked.

see

• https://support.mozilla.org/en-US/questions/959696
• https://support.mozilla.org/en-US/questions/963035
• https://support.mozilla.org/en-US/questions/963027
• https://support.mozilla.org/en-US/questions/963010
• https://support.mozilla.org/en-US/questions/962979
• https://support.mozilla.org/en-US/questions/962990
• https://support.mozilla.org/en-US/questions/963001

Personally, I haven't heard of this, but it's hard to read everything.

Sometimes the file that stores window size and position, and toolbar customization data, becomes corrupted. You can rename the file and customize your toolbars from scratch if you don't find another solution.

Open your current Firefox settings (AKA Firefox profile) folder using

Help > Troubleshooting Information > "Show Folder" button

Switch back to Firefox and Exit

Pause while Firefox finishes its cleanup, then rename localstore.rdf to something like localstore.old

Restart Firefox. Hopefully now your windows will open normally.

Thank You..that worked.