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Running FF 5.0 and get the JavaScript Error "what happened:Components classes'@mozilla.org/extensions/manager;1' is undefined

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I get this error when I bring up FF and also when I go to some sites.

I get this error when I bring up FF and also when I go to some sites.

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Start Firefox in Diagnose Firefox issues using Troubleshoot Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

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The problem has disappeared. I went into safe mode, problem gone, out of safe mode, problem still gone. I trust it will come back, but who knows

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It is possible that some files in the Firefox Profile Folder needed to be rebuild and that starting in safe mode had triggered that.

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