Examine source code of Offline Page Saver

{
  "manifest_version": 2,
  "name": "Offline Page Saver",
  "version": "1.0",
  "description": "Saves entire web pages for offline viewing, with options to exclude ads.",
  "permissions": [
    "activeTab",
    "downloads",
    "storage",
    "webNavigation"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_title": "Offline Page Saver"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{f2a926c7-72be-45f9-9db6-04aabb3f5027}"
    }
  }
}