Examine source code of Everest Community

{
  "theme": {
    "images": {
      "theme_frame": "test.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#cfcdcd"
    }
  },
  "version": "2.0",
  "name": "Everest Community",
  "manifest_version": 2,
  "description": "This one is build for <a href=\"https://outgoing.prod.mozaws.net/v1/6f2e0aa5c14f7a970b5e03c1c43768d07a4cf90c3de48c5dd751a099116d323a/http%3A//Everest-Community.net\" rel=\"nofollow\">Everest-Community.net</a> members which uses Firefox"
}