Examine source code of Speed Page

{
  "name": "Speed Page",
  "description": "Speed Page is a counter of page speed",
  "version": "1.0.3resigned1",
  "manifest_version": 2,
  "icons": {
    "16": "Speed-52.png",
    "48": "Speed-52.png",
    "128": "Speed-52.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/jquery.min.js",
        "content_scripts.js"
      ]
    }
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icons/No Connection-96.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "applications": {
    "gecko": {
      "id": "vahe.araqelyan.2013@hotmail.com",
      "strict_min_version": "45.0"
    }
  },
  "permissions": [
    "tabs",
    "<all_urls>",
    "notifications"
  ]
}