UserAgent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0

Steps to reproduce the problem:
It's a feature request, not a bug

What is the expected behavior?
When I work on a large web application, a lot of files are loaded in "Sources" panel. In the same time, main source window has a lot of tabs open since last debug session.
The improvement would to allow programmer to bookmark or mark as favourable files they work on most often. It would speed up debug experience, since the programmer wouldn't be forced to memorize all files and search them by "CTRL+P".

What went wrong?
It's a feature request, not a bug

Did this work before? N/A 

Chrome version: 53.0.3  Channel: n/a
OS Version: 10.0
Flash Version: