In case one of your extensions is incompatible with the new style search bars in Firefox 34, could you test in Firefox's Safe Mode? That's a standard diagnostic tool to deactivate extensions and some advanced features of Firefox. More info: [[Troubleshoot Firefox issues using Safe Mode]]. ''If Firefox is running:'' You can restart Firefox in Safe Mode using either: * "3-bar" menu button > "?" button > Restart with Add-ons Disabled * Help menu > Restart with Add-ons Disabled Not all add-ons are disabled: Flash and other plugins still run After Firefox shuts down, a small dialog should appear. Click "Start in Safe Mode" (''not'' Reset). ''If Firefox is not running:'' Hold down the Shift key when starting Firefox. A a small dialog should appear. Click "Start in Safe Mode" (''not'' Reset). Any difference?