If you find that when you click on any text on your FireFox browser and a blinking cursor comes out, and wondering what the heck is going on? Don’t worry. There is nothing wrong. It might be caused by an accidental press on a shortcut key. If you have pressed F7, the Caret Browsing will be turned on. This feature puts a movable cursor in your browser window, which allows you to select text with keyboard, to turn it off, simply press F7 again, and the problem will be gone.