Fiddler's "Web Browsers" filter does not include msedge.exe as a web browser. This is the executable name of the new Chromium-based version of Edge that Microsoft is now working on.
This should be a one-line fix and very much appreciated by the many thousands of Fiddler+Edge users.
I'm trying many times this shortcut but it's doesn't work. When i'm try to copy Single Header with CTRL + C it's work but when i'm try to copy single header's value with CTRL + SHIFT + C shortcut it's didn't work.