I often have multiple windows each with multiple tabs open (I have 64Gb memory) and frequently loses track of a specific page. At the moment I have 81 tabs open to different stories on royalroad.com for example.
I often uses the Taskmanager, about:processes to find out if some page is already open and it would be nice if could right click on a process and have that window moved to front and the specific tab opened. I guess it would work equally well with another about: page
If there already exist something that solves my problem I at least doesn't know about it.