Privacy policy summary: "We metaphorically have someone sitting besides you with an unblinking eye, watching and recording every keystroke you type and every website you visit and save this information for profit"

It's sad users are subjected to legalese and spyware has become the accepted norm among 'free and proprietary' services. If this were some random add-on developed by some nobody it would have been appropriately removed from mozilla services.

Protip: Firefox already has Google Safebrowsing for malware. All you really need is to block ads and malware domains with Ublock add-on and scan files with the virustotal website. If you still need this add-on, maybe you should reconsider your browsing habits.