Wouldn’t you like to know what type of file you are about to visit just by hovering over the link? That is what the folks who wrote this next extension must have had in mind. The Link Alert Firefox extension changes the cursor when you hover over a link to show you what type of file it is. If it is a .txt file, you get a little notepad icon. If it is an image, then you get a little picture icon. Such a simple idea, but it works and works well.