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How to use Thunderbird's Troubleshoot Mode to find and fix problems, especially if they are caused by add-ons.

'''Troubleshoot Mode''' runs Thunderbird with some features and customizations disabled, so you can see whether the cause of your problem is one of the disabled items. The disabling is '''temporary''' unless you choose to make the changes permanent. [[#w_what-does-troubleshoot-mode-disable|The list of disabled items]] is detailed below. '''Troubleshoot Mode does not affect your data.''' __TOC__ = Starting Thunderbird in Troubleshoot Mode = # Switch to Troubleshoot Mode: #* '''If Thunderbird is not running:''' {for win}Hold down the {key Shift} key while starting Thunderbird.{/for}{for mac}Hold down the {key option} key while starting Thunderbird.{/for}{for linux}From '''Terminal''', run this command: <code>thunderbird -safe-mode</code><br>You may need to specify the Thunderbird installation path (e.g. {filepath /usr/lib/thunderbird} or {filepath ~/Downloads/thunderbird/thunderbird}).{/for} #* '''If Thunderbird is already running:''' Click {button ≡} > {menu Help} > {menu Troubleshoot Mode...} and in the ''Restart in Troubleshoot Mode'' prompt, choose {button Restart}. # In the '''Thunderbird Troubleshoot Mode''' dialog box, click {button Continue in Troubleshoot Mode} button. #;[[Image:tb-115-trouble-shoot-mode-cropped]] #;{note}If you want Troubleshoot Mode changes to be temporary, do not check the checkboxes - temporary is the default. But you can choose to make the changes permanent.{/note} # Click {button ≡} > {menu Help} and check if you see {menu Turn Troubleshoot Mode Off} in the menu, to confirm that Thunderbird is currently running in Troubleshoot Mode. = Turning Troubleshoot Mode Off = Click {button ≡} > {menu Help} > {menu Turn Troubleshoot Mode Off} to immediately close Thunderbird and restart it in normal mode. Or you can exit Thunderbird and start as you normally would. = Diagnosing Problems in Troubleshoot Mode = After starting Thunderbird in '''Troubleshoot Mode''', test its behavior to see if the problem goes away. == The problem still happens in Troubleshoot Mode == If the problem still happens in Troubleshoot Mode, then it is not caused by an extension or theme installed in Thunderbird. Possible causes and solutions include: {for win} * Something wrong with your Windows operating system or operating environment. Please start [https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode Windows in safe mode]. If the problem is resolved in Windows safe mode, then the cause is likely a program loaded during Windows startup. Possibilities include: antivirus software (AV), virus/malware, background downloads such as Windows or other program updates to name a few. For AV information see https://wiki.mozilla.org/Thunderbird:Testing:Antivirus_Related_Performance_Issues. {/for} {for win, mac} * Something is wrong with your Thunderbird installation. Please try reinstalling Thunderbird from https://www.thunderbird.net/. {/for} {for linux} * Something is wrong with your Thunderbird installation: If you had installed Thunderbird using the Linux package manager, then try reinstalling it. Also investigate possible library conflicts, and consider using the Thunderbird supply package from https://www.thunderbird.net/. {/for} * A problem with your mail provider. For example, [[Cannot receive messages|not being able to recieve]] or [[Cannot send messages|not being able to send messages]]. * Changes made to Thunderbird preference settings not disabled in Troubleshoot Mode. You might [[Using Multiple Profiles|try creating a new profile]]. (But do not delete your current profile.) * A bug in Thunderbird. [https://support.mozilla.org/en-US/questions/new/thunderbird Ask for help to determine if it is a bug]. Please file a bug if you have determined with Thunderbird Help Support that the problem is with Thunderbird. <!-- See the following articles for solutions: *[[Troubleshoot and diagnose Firefox problems]] --> <!-- *[[Reset Firefox preferences to troubleshoot and fix problems]] --> == The problem no longer happens in Troubleshoot Mode == If the problem no longer happens in Troubleshoot Mode, the most likely cause is an extension, theme, or hardware acceleration. Possible solutions include switching back to normal mode, then doing the following: (You may need to restart Thunderbird after each step to see if it solves the problem.) * Progressively disable extensions in the add-ons manager: Click {button ≡} > {button Add-ons and Themes} > {button Extensions}, then check to see if the problem remains after disabling each extension. When the problem goes away, the last disabled extension is most likely the cause of trouble. Try to updating, reinstalling, removing, or leaving the disabled extension currently disabled. * Set the default theme in the add-ons manager: Click {button ≡} > {button Add-ons and Themes} > {button Themes}, then enable the default theme. * Turn off the hardware acceleration in Thunderbird's settings: Click {button ≡} > {menu Settings} > {menu General}, then uncheck {menu Use hardware acceleration when available}. <!-- See this article for solutions: *[[Troubleshoot extensions, themes, and hardware acceleration issues to solve common Firefox problems]] --> = What Does Troubleshoot Mode Disable? = *[[Thunderbird add-ons - frequently asked questions|Add-ons (extensions and themes)]] *[[Upgrade your graphics drivers to use hardware acceleration and WebGL|Hardware acceleration]] *[[Changes to toolbars and window sizes are not saved|Window and sidebar size and position settings]] (described in terms of Firefox) *userChrome and userContent customizations ; see [[userChrome.css and .js and userContent are unsupported]] *[https://hacks.mozilla.org/2017/02/a-crash-course-in-just-in-time-jit-compilers/ JavaScript Just-in-time (JIT) compiler]