Examine source code of D.A. Theme

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#2b8501",
      "tab_background_text": "#c8ffc7"
    }
  },
  "version": "2.0",
  "name": "D.A. Theme",
  "manifest_version": 2,
  "description": "Das ist ein offizielles D.A. Firefox Theme."
}