Examine source code of Page description finder

{
  "manifest_version": 2,
  "name": "Page description",
  "author": "Pythack",
  "version": "2.0.0",
  "description": "Finds a description of the current webpage. ",
  "background": {
    "scripts": [
      "./background.js"
    ],
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "get_desc.js"
      ]
    }
  ],
  "icons": {
    "16": "images/icon-16.png",
    "48": "images/icon-48.png",
    "128": "images/icon.png"
  },
  "options_ui": {
    "page": "./options/options.html"
  },
  "permissions": [
    "<all_urls>",
    "storage",
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "./images/iconnotok.png",
    "default_popup": "./popup/popup.html",
    "default_title": "Page description",
    "browser_style": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7010d5e0-c4ac-44a4-8cc5-0fd3d010be79}"
    }
  }
}