Examine source code of SepiaFox

{
  "manifest_version": 2,
  "name": "SepiaFox",
  "version": "1.1",
  "description": "firefox looks like a paper.",
  "theme": {
    "colors": {
      "frame": "#e4dcc8",
      "tab_background_text": "#000000",
      "tab_line": "#e4dcc8",
      "ntp_background": "#f4ecd8",
      "toolbar_field": "#e4dcc8",
      "toolbar_field_focus": "#f4ecd8"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d295889d-5b69-4a6b-bb35-dc80d55a36cd}"
    }
  }
}