This is a short one.
Sometimes on during development on the front-end you need to fill out a very long form. Filling the from by hand is annoying when debugging.
The rescue is Selenium IDE, which will record which fields you selected and what you typed into them. This can be later replayed, making the form be filled out in 3 seconds (automatically) instead of 3 minutes (by hand) https://addons.mozilla.org/en-US/firefox/addon/selenium-ide/