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My Internet Security has gone. How do I get it back on this browser?

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My Trend Micro Internet Security which keeps me safe from all bad places has disappeared leaving me feeling unprotected, which I don't like at all. How do I get it back on this updated firfox? If this can't be done I would like to revert back to the older version where I feel safer. Could you please then give me instructions on how to uninstall this version and install the later version. Thank you

My Trend Micro Internet Security which keeps me safe from all bad places has disappeared leaving me feeling unprotected, which I don't like at all. How do I get it back on this updated firfox? If this can't be done I would like to revert back to the older version where I feel safer. Could you please then give me instructions on how to uninstall this version and install the later version. Thank you

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See TrendMicro for an updated version of their Firefox extensions.