Firefox is already super fast. Loading of web pages is completely depends onto speed of your data connection or internet. just follow following few tips this might be useful :- 1) Remove unwanted adons by typing about:addons into url bar. 2) Try mirror sites of the same web sites. 3) Try mobile sites but it provides less features. 4) Try private browsing by shortcut key ctrl+shift+p 5) Clear caches and additional data from setting tab or goto about:preferences Wish this helps and explorer the ocean of web thank you!

You can block some content, like pictures or clips from playing.