Examine source code of PlusPassword

{
  "name": "PlusPassword",
  "description": "Password sharing done secure, simple, and covert",
  "version": "0.2.0",
  "manifest_version": 2,
  "background": {
    "scripts": [
      "./static/js/background.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "scripting",
    "management",
    "privacy",
    "cookies",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "index.html",
    "default_title": "PlusPassword",
    "default_icon": {
      "16": "/media/logos/logo_16x16.png",
      "32": "/media/logos/logo_32x32.png",
      "48": "/media/logos/logo_48x48.png",
      "128": "/media/logos/logo_128x128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "./static/js/content.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "*"
  ],
  "icons": {
    "16": "/media/logos/logo_16x16.png",
    "32": "/media/logos/logo_32x32.png",
    "48": "/media/logos/logo_48x48.png",
    "128": "/media/logos/logo_128x128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{aa5f2dd7-1eaa-4645-9d05-55e4eb164ea1}"
    }
  }
}