Examine source code of collector browser

{
  "name": "collector browser",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "firefox theme.png"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)",
      "toolbar": "rgba(196, 228, 230, 1)",
      "bookmark_text": "rgba(0, 0, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 1)",
      "toolbar_field_text": "rgba(194, 138, 138, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2efa8bdd-6eef-431c-84e0-24862d5c555b}"
    }
  }
}