Examine source code of SapBoy

{
  "name": "SapBoy",
  "manifest_version": 2,
  "version": "1.1resigned1",
  "theme": {
    "images": {
      "theme_frame": "Firefox.jpg"
    },
    "colors": {
      "frame": "rgba(0, 0, 0, 1)",
      "tab_background_text": "rgba(150, 0, 0, 1)",
      "bookmark_text": "rgba(150, 0, 0, 1)",
      "toolbar_field_text": "rgba(23, 153, 51, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{103c8209-4e9b-419a-8053-fa415413bee5}"
    }
  }
}