Examine source code of Bills

{
  "name": "Bills",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "images.jpg"
    },
    "colors": {
      "frame": "rgba(31, 74, 173, 1)",
      "tab_background_text": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{873d4b25-9994-457c-8264-56759d7367ba}"
    }
  }
}