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My firefox has jumped back to an earlier setting and I cannot get it back to latest

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jltfreda
jltfreda
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My firefox has jumped back to an earlier setting and I cannot get it back to latest computer did an update and that's when it went wrong also get message cannot load xpcom Help.

My firefox has jumped back to an earlier setting and I cannot get it back to latest computer did an update and that's when it went wrong also get message cannot load xpcom Help.

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cor-el
cor-el
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An error message about XPCOM missing 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.

Modified by cor-el