This module fills in a missing piece of functionality. In Media Browser (media_wysiwyg) you cannot easily edit the fields of a file entity from the wysiwyg once the file is added.
This adds an "Edit" link above the preview image when you click the Media button for an existing embedded asset. Clicking the link opens the full file edit screen in another window.
This is designed to be compatible with Media 2.x branch. It plays nice with manualcrop, and adds "crop" to the link if present.