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How can I cure/stop this error message on startup 'Exc in ev handle: TypeError: this.oRoot.enable is not a function'

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When starting Firefox 8.0, I get a '[JavaScript Application]' dialogue box with the above error message. When I click OK in dialogue box, Firefox then appears to start normally. What could be the cause, and how do I go about curing it?

When starting Firefox 8.0, I get a '[JavaScript Application]' dialogue box with the above error message. When I click OK in dialogue box, Firefox then appears to start normally. What could be the cause, and how do I go about curing it?

GowerMick modificouno o

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Duplicate - questions/896648