Hi 1. Since you mentioned you love Firefox for its add-ons, one of them might be reacting poorly to the new update. Go to Help > Troubleshoot Mode When you run Firefox in [Use Troubleshoot Mode in Firefox Troubleshoot Mode], add-ons and some other features and customizations are disabled. Try again. If the flickering disappears, one of your extensions is likely the cause. 2. Firefox automatically chooses performance settings based on your computer’s hardware and operating system. These recommended settings work well for most users, but you can adjust them for better speed, lower memory usage, or improved stability. To change your performance settings: * Click the Menu button and select Settings. * In the General panel, go down to the Performance section. * Uncheck the box next to Use recommended performance settings. '''Hardware acceleration''': Lets Firefox use your computer’s graphics processor (GPU) to display videos, games and animations, reducing load on the main processor (CPU). More info [[Firefox's performance settings]]