Examine source code of ShareLogIn

{
  "manifest_version": 2,
  "name": "ShareLogIn",
  "description": "Share your LogIn without sharing your password",
  "version": "1.2",
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "16": "16.png",
    "32": "32.png",
    "48": "48.png",
    "64": "64.png",
    "96": "96.png",
    "128": "128.png"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "<all_urls>",
    "cookies"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "open.js"
  ]
}