Hide plugins, visited links and WebRTC from websites in Firefox

Shows how this works and some add-ons, settings to prevent it.

" Whenever you connect to a website using any browser, the site receives a variety of information automatically. While not all sites process the information or record them, some may very well use them for tracking and other purposes. "

Source: gHacks Tech News
Details  Hide plugins, visited links and WebRTC from websites in Firefox