- Type about:support into the Firefox address bar.
- To the right, click the Refresh Firefox… button under Give Firefox a tune up.
- A Refresh Firefox dialog will display with information about what will happen if you proceed. Click the Refresh Firefox button to continue.
- Firefox will close while it refreshes, and then relaunch. When Firefox relaunches, you will have the option to Restore all Windows and Tabs, or Restore only the ones you want.