It's important to be aware of browsers add-ons, as reason there has no special surety to work with full faith that your data won't lost by using add-ons.
I don't usually download add-ons so I think I'm safe from that but I'm still taking precautionary measures when it is about downloading any file on the web. This got me a feeling of not downloading files even the most important that I have to save.
I started to have anxiety about this although I'm aware of the files that I should ignore and never entertain any of them. But the feeling was already there and it's really fearing me even though I know how to take care of it.