I can look for an alternative if the extension is not trusted. Firefox always alerts me about the extension I'm going to add, That whether it is trusted or not. Moreover, I have liked the extension feature of firefox too much, Currently, I have added 7 extensions to firefox but I may add as many third-party extensions as I want. If the lock icon is appearing on a site, then it means that the connection is secure and we are safe otherwise we should be careful while using an unsecured site. Address bar always indicates me, the site I'm using, whether that is secure or not. Moreover address bar is so awesome and cool. I thought the social media may leaks out our privacy and may lead us to huge problems, that's why I always use a standard layer of firefox privacy to avoid of any problem. I have not found the option of blocking social media trackers in any other browser except the firefox. Pros: I have liked the privacy feature of firefox too much.