Examine source code of Popup Blocker

{
  "name": "Popup Blocker",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "pop-up.png"
    },
    "colors": {
      "frame": "rgba(235, 233, 232, 1)",
      "tab_background_text": "rgba(219, 55, 55, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{32ab3da1-e725-4af5-83dd-6f2b474ec498}"
    }
  }
}