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| If your Firefox/Thunderbird/Seamonkey was working fine but isn't anymore, follow these steps.
| | *[[Standard diagnostic - Firefox]] |
| | *[[Standard diagnostic - Thunderbird]] |
| | *[[Standard diagnostic - SeaMonkey|Standard diagnostic - Mozilla Suite / SeaMonkey]] |
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| #Reboot your computer. If the problem persists, continue on.
| | [[Category:Redirects]] |
| #Completely close the problem application (using "File -> Exit").
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| #[[Kill application | Make sure the application is not running in the background.]]
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| #''(Firefox and Thunderbird only)'' Start the application in [[Safe Mode]] (not Windows Safe Mode). If the problem doesn't exist in Safe Mode, the problem is most probably with one of your themes or extensions. Select the default theme in "Tools -> Themes" and use "Tools -> Extensions" to uninstall extensions (although the extensions appear grayed out, you will still be able to uninstall them). If the problem occurred after installing or updating a particular extension, you can try first just uninstalling that one. Restart Firefox/Thunderbird. If the problem exists in Safe Mode or was not solved by switching themes and uninstalling extensions, continue on.
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| #[[Profile backup | Back up your profile]].
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| #Perform steps 2 and 3 again, then delete "XUL.mfl" (the name may differ slightly, e.g. "xul.mfasl") from your [[profile folder]]. This file will be regenerated on next startup. If the problem persists, continue on.
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| #Perform steps 2 and 3 again, then delete "chrome" and "extensions" folders in your profile folder. '''You will lose all your extensions and themes.''' If the problem persists, continue on.
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| #Perform steps 2 and 3 again, then delete the "Cache" folder in your profile folder. '''You will lose your cache.''' If the problem persists, continue on.
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| #Perform steps 2 and 3 again, then [[Profile manager | create a new profile]]. If the problem is fixed, you had a [[Profile Folder#What do I do if my profile's corrupted? | corrupt profile]]. If the problem persists, continue on.
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| #Uninstall the application, download it again, and reinstall.
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