Examine source code of Firefox or et carbone

{
  "theme": {
    "images": {
      "theme_frame": "Carbonne_en-tte3.png"
    },
    "colors": {
      "frame": "#d9e80e",
      "tab_background_text": "#ab2020"
    }
  },
  "version": "2.0",
  "name": "Firefox or et carbone",
  "manifest_version": 2,
  "description": "Firefox en or liquide sur fond carbone."
}