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Try turning off hardware acceleration in Thunderbird's settings: Click ≡ > Settings > General, then uncheck Use hardware acceleration when available.Furthermore, you can find the Troubleshooting Login Issues section which can answer your unresolved problems and equip you with a lot of relevant information. Set the default theme in the add-ons manager: Click ≡ > Add-ons and Themes > Themes, then enable the default theme. LoginAsk is here to help you access Mozilla Thunderbird Sign In Email quickly and handle each specific case you encounter.You can try to update it, reinstall it, leave it disabled, or remove it. When the problem goes away, the last disabled extension is probably the trouble causer. Progressively disable extensions in the add-ons manager: Click ≡ > Add-ons and Themes > Extensions, then check if the problem remains after disabling each extension.(You may need to restart Thunderbird after each step to see if it solves the problem.) Possible solutions include switching back to normal mode, then doing the following. If the problem no longer happens in Troubleshoot Mode, the most likely cause is an extension, theme or hardware acceleration. The problem no longer happens in Troubleshoot Mode

Changes made to Thunderbird preference settings not disabled in Troubleshoot Mode.Something wrong with your operating system: Start Windows in safe mode.