Examine source code of Endfield v1

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Endfield v1",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(39, 41, 41)",
      "toolbar_text": "rgb(248, 245, 70)",
      "frame": "rgb(26, 28, 29)",
      "tab_background_text": "rgb(248, 245, 70)",
      "toolbar_field": "rgba(73, 82, 85, 0.95)",
      "toolbar_field_text": "rgb(248, 245, 70)",
      "tab_line": "rgb(248, 245, 70)",
      "popup": "rgba(49, 55, 57, 0.95)",
      "popup_text": "rgb(248, 245, 70)",
      "tab_loading": "rgb(248, 245, 70)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e25c299-eb1b-4cf5-a26d-dfdc8aca8cad}"
    }
  }
}