confusion Assegnate 3 su 5 stelle

I dont know much about computers but I did just get a virus on my laptop from viewing my favorite page. So I started using my old PC and downloaded this to my firefox. However I am confused as to what I am doing. I don't want to allow it to do something that could harm my PC. I wish they had more information about what I need to do with this. I'm sure that after I figure it out it will definitely be a 5 star add-on

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