Examine source code of HTTPS+ Checker

{
  "manifest_version": 2,
  "name": "HTTPS+ Checker",
  "version": "0.0.4resigned1",
  "description": "Verification of security mechanisms complementary to HTTPS",
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "<all_urls>"
  ],
  "browser_action": {
    "default_title": "HTTPS+ Checker",
    "default_icon": {
      "48": "icon_x48.png",
      "96": "icon_x96.png"
    },
    "default_popup": "popup/index.html"
  },
  "icons": {
    "48": "icon_x48.png",
    "96": "icon_x96.png"
  },
  "options_ui": {
    "page": "settings/options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b6c51e19-dafa-4207-a133-b39ac9f7f7c2}"
    }
  }
}