The question then comes up, how do I do something similar in a web app to improve my productivity?
Don't have a browser with the "Duplicate" function, not a problem, just copy the URL (address in the address bar) of the page you are currently on and then paste that URL into the address of a new tab. You get the same result.
Recommendation: This works great from List screens, Tile screens, Home pages, and View item screens; not so great from an Edit screen... If you are currently editing an item, close it before duplicating the screen.
Of course, another way to do something similar is to just open a new tab and then use your saved shortcut or bookmark to open MRSweb in that tab as well.
Productivity Tip: Have a long-running Project that you are working on, wish you could open directly to that Project instead of the Home page -> navigate to the Projects listing -> find the one you were working on? When you are on that Project's page, click the Bookmark button or Add to Homescreen button to create a shortcut directly to that individual entry... You can have a tab open with the Project you work on a lot, and a separate tab with another session at the same time.