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Firefox 9.01 keeps checking addon compatibility at startup. UGGH

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  • Last reply by Greg

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Firefox 9.01 keeps checking addon compatibility at startup. The option is not checked and the previous addon to disable doesn't work. Ideas?

Firefox 9.01 keeps checking addon compatibility at startup. The option is not checked and the previous addon to disable doesn't work. Ideas?

Chosen solution

You can check these KB articles:


It is possible that there is a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is a compatibility update available.

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Chosen Solution

You can check these KB articles:


It is possible that there is a problem with the file(s) that store the extensions registry.

Delete the files extensions.* (e.g. extensions.sqlite, extensions.ini, extensions.cache) and compatibility.ini in the Firefox profile folder to reset the extensions registry.

New files will be created when required.

See "Corrupt extension files":

If you see disabled, not compatible, extensions in "Tools > Add-ons > Extensions" then click the Tools button at the left side of the Search Bar (or click the "Find Updates" button in older Firefox versions) to do a compatibility check or see if there is a compatibility update available.

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Thanks for the information. Nothing worked, so I just uninstalled everything deleting all saved preferences and reinstalled. All is working now.