Pressing the Red Button

Hold down Control Key, Click Refresh Button

or

Control-F5

The keyboard shortcut is a bit of a hand stretch so I stick with the control key and mouse click.

How does this help?
Doing a full page refresh will go back to the web server to get the latest version of the page you are viewing. This helps with troubleshooting or when you are seeing results that are unexpected. To confirm you can force a refresh of the page.
You might also find this helpful when coding on your local machine, sometimes the browser will not detect a javascript change you are working on. Getting in the habit of doing a full refresh will save your sanity.