Extensions
Number of search results for developer 'gorhill': 3
uBlock Origin
Finally, an efficient blocker. Easy on CPU and memory.
uMatrix
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
HTTP Switchboard
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.