The second step to speed up page loading is to disable unnecessary Flash which slows down the system, to do this you can use Firefox plug-in, called Flashblock, you can download it here https://addons.mozilla.org/en-US/firefox/addon/flashblock/. To view Flash you just need to click your left mouse button.
The third step. NoScript plug-in also speeds up page loading by blocking scripts are frequently used sites for display advertising, but disable scripting functionality of the site can not work and then have to resolve scripts on this site to complete the work. You can download it here https://addons.mozilla.org/en-US/firefox/addon/noscript/
for racing videos from various sites you can use plug-in Flash Video Downloader, which can be downloaded here https://addons.mozilla.org/en-US/firefox/addon/flash-video-downloader-youtube/
Just a lot of other Internet plug-ins that will help you in working with the Internet, but do not forget that too many plug-ins also inhibit the browser, so try to choose only the most necessary and then you will be happy.