UPDATE

Sadly, Google has taken the extension down for not using their super-lame new manifest V3.
I don’t care to fix it for one simple reason: SN Utils is way better. Go check out that Chrome extension instead. :-)

Download: Chrome Web Store

Article/Documentation

I often find myself middle-clicking a link or otherwise opening links in ServiceNow in a "new tab" or "new window". This means that I often get pages that load just the content frame, without the ServiceNow frame. 

The ServiceNow frame is the header and side-bar that facilitate easy navigation around ServiceNow, and easy access to various useful UI elements. When you open a link in ServiceNow in a new tab, you lose this frame. Your options to get back into the ServiceNow frame, are to either manually modify the URL by adding nav_to.do?uri=... to the URL after the domain, or to go back to your ServiceNow instance home page and start from scratch. 

Highly irksome

This tool allows you to click a button in your browser and immediately return the page you're on, to the ServiceNow frame.
It's that simple.