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Firefox doesn't open. Couldn't load XPCOM

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  • Last reply by cor-el

desbest
desbest
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Hello

'Firefox crashed so I sent an error report. Then Firefox was installing updates. Then it never opened because it said an error saying Couldn't load XPCOM. I then click OK then the error closes and nothing happens. Firefox cannot open.

How do I fix this?

Hello 'Firefox crashed so I sent an error report. Then Firefox was installing updates. Then it never opened because it said an error saying Couldn't load XPCOM. I then click OK then the error closes and nothing happens. Firefox cannot open. How do I fix this?

Chosen solution

An error message about XPCOM or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You need to do a clean reinstall and remove the Firefox program folder to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

Note that Firefox 81.0.2 has been released, see "Help -> About Firefox".

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cor-el
cor-el
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Chosen Solution

An error message about XPCOM or about platform version usually happens because of a failed Firefox update that left you with a mixture of old and updated files in the Firefox program folder. This can happen in case security software was keeping a handle of some of the files in the Firefox program folder preventing Firefox from replacing all the files. You need to do a clean reinstall and remove the Firefox program folder to ensure that all files are replaced. You may have to disable security software temporarily in case the problem persists.

Note that Firefox 81.0.2 has been released, see "Help -> About Firefox".

Modified by cor-el