Hello, Are you using the latest version of Firefox (version 33)? If not, try updating Firefox in Windows by going to: * Help (or [[Image: New Fx Menu]] > [[Image: Help-29]]) > About Firefox Or downloading and installing a fresh copy from: * https://www.mozilla.org/en-US/firefox/new/ * (if you need a different localization) https://www.mozilla.org/en-US/firefox/all/ ------------------------- Try updating your graphics drivers, see this article for more details: * [[Upgrade your graphics drivers to use hardware acceleration and WebGL]] If your drivers are up to date and you are still experiencing issues, try disabling graphics hardware acceleration to see if that causes Firefox to run more smoothly on Windows. 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 menu button [[Image:New Fx Menu]] and select ''Options''. # In the Firefox Options (or Preferences) 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. * [[Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems]] If you are experiencing these issues in version 33 and disabling hardware acceleration appears to fix it, please fill out the following survey: * http://www.surveygizmo.com/s3/1851506/1c87a6cf309a Did this fix your problems? Please report back to us! Thank you.