An anonymous reader writes: One of the most powerful features of modern browsers is the ability to install third-party extensions. They allow third-party developers to work on really useful niche functionality, and let users customize their browser with the tools they need. Unfortunately, this environment has the same discover-ability and security problems as standalone software. Thus, my question: what are your most useful (and safe) browser extensions? I can't live without some privacy basics like NoScript, AdBlock, and Ghostery. I also find FoxyProxy helpful for getting around geolocation requirements for media streaming. OneTab works pretty well for saving groups of browser tabs, and Pushbullet keeps getting better at managing my phone while I'm at my PC.