Mozilla add-ons / extentions are install-able enhancements to the Mozilla Firefox. Extensions add all sorts of new functionality to your browser that it doesn’t have out of the box.
While extensions are loved by many people, unfortunately they aren’t all trustworthy. For every productivity-boosting extension, there’s a useless or malicious one that wants to track your habits, spam you with ads, or even hijack your browsing.
Permission Inspector is a brand new extension for the Firefox web browser that gives a snapshot of all the permissions used by different installed extensions.