Examine source code of Firedge

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Firedge",
  "theme": {
    "images": {},
    "properties": {},
    "colors": {
      "toolbar": "rgb(247, 247, 247)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(56, 57, 60)",
      "tab_background_text": "rgb(247, 247, 247)",
      "toolbar_field": "rgb(247, 247, 247)",
      "toolbar_field_text": "rgb(56, 57, 60)",
      "tab_line": "rgb(247, 247, 247)",
      "popup": "rgb(56, 57, 60)",
      "popup_text": "rgb(247, 247, 247)",
      "tab_loading": "rgb(247, 247, 247)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{83b8ab36-ffab-4782-b9a0-3ac39fb1cbf7}"
    }
  }
}