Examine source code of Show Saved Password

{
  "manifest_version": 2,
  "name": "Show Pass",
  "version": "1.1",
  "description": "Show All Password",
  "icons": {
    "48": "eye.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}