Hello,

First make sure you are running Firefox version 33.0.3:

• Go to Help (or > ) > About Firefox

Try Firefox Safe Mode to see if the problem goes away. Firefox Safe Mode is a troubleshooting mode that turns off some settings, disables most add-ons (extensions and themes).

If Firefox is open, you can restart in Firefox Safe Mode from the Help menu:

• Click the menu button , click Help and select Restart with Add-ons Disabled.

If Firefox is not running, you can start Firefox in Safe Mode as follows:

• On Windows: Hold the Shift key when you open the Firefox desktop or Start menu shortcut.

When the Firefox Safe Mode window appears, select "Start in Safe Mode".

If the issue is not present in Firefox Safe Mode, your problem is probably caused by an extension or hardware acceleration. Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article to find the cause.

To exit Firefox Safe Mode, just close Firefox and wait a few seconds before opening Firefox for normal use again.

To disable Hardware Acceleration:

1. Click the menu button and select Options for Windows or Preferences on Mac or Linux.
2. In the Firefox Options (or Preferences) window, click the Advanced tab, then select General.
3. In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
4. 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 article:

• Upgrade your graphics drivers to use hardware acceleration and WebGL

When you figure out what's causing your issues, please let us know. It might help others with the same problem.

I am NOT newbie. I run the firefox 33.0.3 and already try the safe mode but DOESN'T WORK so....

Which steps have you tried?

Have you tried clearing your cache and loading the pages?

See also:

• http://kb.mozillazine.org/Websites_look_wrong
• http://kb.mozillazine.org/Website_colors_are_wrong

You can delete a possible user.js file and numbered prefs-##.js files and rename (or delete) the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in the current Firefox release.

• http://kb.mozillazine.org/Preferences_not_saved

Create a new profile as a test to check if your current profile is causing the problem.

See "Creating a profile":

• https://support.mozilla.org/kb/profile-manager-create-and-remove-firefox-profiles
• http://kb.mozillazine.org/Standard_diagnostic_-_Firefox#Profile_issues

If the new profile works then you can transfer files from a previously used profile to the new profile, but be cautious not to copy corrupted files to avoid carrying over problems.

• http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

So DOESN'T exist any solution about that?

And it do me the exactly same thing into 3 pc's(1 laptop, 1 desktop, 1 netbook) So i DON'T BELIEVE it is my pc fault but firefox fault because i don't see any similar issues/problems at other browsers like chrome or internet explorer.