SmarterFox is the most popular productivity Firefox addon which saves time by speeding up common tasks. This Firefox addon will help you get things done much quicker by getting faster, parallelized downloads, convenient shortcuts and more. If you don’t want or like any of its features, you can easily disable them from the menu Tools > SmarterFox. You can download this addon from Download SmarterFox.

• To save Web videos right-click anywhere and then select “download page media”;
• You can download all images and links of a page in parallel, maximizing the usage of your bandwidth;
• When you reach the end of the page, SmarterFox will automatically load the next page and append it to the end, saving you time;
• To open the qLauncher, press Ctrl + Space. You can change this in the options dialog.
• https://addons.mozilla.org/en-US/firefox/addon/9825