* Or open the Help menu and click on the '''Restart with Add-ons Disabled.''' menu item while Firefox is running. Note down the name of the active adapter. Here you can see all the network connections on your PC. Type ncpa.cpl in the Run box and hit Enter. *You can open Firefox 4.0+ in Safe Mode by holding the '''Shift''' key when you open the Firefox desktop or Start menu shortcut. Right click Windows Start menu and choose Run or press Windows + R keys on the keyboard to bring up the Run dialog box. If it works in Safe Mode and in normal mode with all extensions (Tools > Add-ons > Extensions) disabled then try to find which extension is causing it by enabling one extension at a time until the problem reappears.Ĭlose and restart Firefox after each change via 'Firefox > Exit' (Windows: Firefox/File > Exit Mac: 'Firefox > Quit Firefox' Linux: 'Firefox/File > Quit') Once you get the pop-up, just select ''Start in Safe Mode'.Or open the Help menu and click on the Restart with Add-ons Disabled.

You can open Firefox 4.0+ in Safe Mode by holding the Shift key when you open the Firefox desktop or Start menu shortcut.

Start Firefox in Safe Mode to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance).

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