In the Mac OS it is possible to change the default program the operating system will use to open a file when you double-click on it. After you have changed this file association, though, you may want ...

When you double-click a file on your Mac, the operating system will automatically open the file using the program assigned to that type of file. It is possible, though, to open the file using another ...

Ever since we started releasing home-brewed Firefox extensions here at Lifehacker, several readers have asked: How difficult is it to build a Firefox extension? For someone with a bit of programming ...