Open the browser. Press F12 on the keyboard. Optional: Click Tools > F12 Developer Tools.

Make Sure the Fn Keys Are Not Locked\n\n On your keyboard, look for an Fn, F lock, or F Mode key. Depending on your laptop, you should press for one time or press and hold for a few seconds. If this doesn't work, press the Fn and Esc keys at the same time. Then, try to use one of the Function keys.