Hello there, This may be caused by the large amount of visited sites and as a result this can slow down Firefox on launch/start. Can you please try to clean your browsing history and cookies by doing the following: 1. Click the menu button, choose "History", and then "Clear Recent History 2. Select how much history you want to clear ( Everything is recommended) 3. Finally, click the "Clear Now" button. If none of the above work then I would suggest to reinstall Firefox and see if that solves the issue. Keep us posted!