When I click the extensions button, the "Personalize your Firefox" page loads. The extension menu does not appear. Steps: 1. All extensions are enabled. I have disabled them and re-enabled them. 2. In the Privacy and Security settings, I have confirmed that "Let Firefox make personalized recommendations" is unchecked. As the problem persisted, I unchecked every data collection box. 3. I have re-started Firefox, re-started the computer, uninstalled and reinstalled Firefox. 4. The extension button functioned perfectly well for the life of this computer. The only difference between yesterday and today is that I hibernated the computer last night. I always do that and the extension button always displays menu -- until today.