Examine source code of A111 Save All Work

{
  "manifest_version": 2,
  "name": "A111 Save All Work",
  "version": "0.2",
  "description": "Saves the current page state",
  "browser_specific_settings": {
    "gecko": {
      "id": "cbrodski@gmail.com",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "48": "icons/icons8-save-48.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "sessions",
    "storage"
  ],
  "browser_action": {
    "default_icon": "icons/icons8-save-48.png",
    "default_title": "A111 Save All Work",
    "default_popup": "popup/popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ]
}