Mozilla Firefox is the most powerful Internet browser and a good alternative to the plain old Microsoft Internet Explorer. Firefox has many advanced features and is much more customizable in numerous ways. Firefox when installed will have default settings, but you can tweak a few of these internal settings to make it run faster. Now to do this click Control + J shortcut and this brings up the downloads window in Firefox. Now having many files in that list can slow down you browser a little as it has an impact on memory. So go ahead and clear them. Use the Clean Up button to do this. Note that this does not delete the original files from you computer but simply erases the list of downloaded files from this window. This video shows how to speed up Firefox by doing some simple tweaks.