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F-Secure online safety extension not compatible with Firefox 28.0

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Having downloaded F-Secure Safe from Virgin Media the online safety extension is disabled, there's no enable function in add-ons manager, could you please inform me how to activate the extension.

Having downloaded F-Secure Safe from Virgin Media the online safety extension is disabled, there's no enable function in add-ons manager, could you please inform me how to activate the extension.

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Install a Firefox 28 compatible version of that extension.

If you just installed that program run a "live update" (or whatever F-Secure calls their manual user update procedure).