Examine source code of Link Peek

{
  "name": "Link Peek",
  "description": "Shows a summary of a link / URL",
  "version": "0.0.0.8",
  "manifest_version": 2,
  "browser_specific_settings": {
    "gecko": {
      "id": "{b7d634aa-c6ae-3549-d755-a9b5c7ee61a8}",
      "strict_min_version": "42.0"
    }
  },
  "permissions": [
    "storage"
  ],
  "web_accessible_resources": [
    "url_script.js",
    "images/loading.png",
    "images/cancel.png",
    "images/icon-green.png",
    "images/icon-red.png"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "default_icon": {
      "16": "images/icon16.png",
      "24": "images/icon24.png",
      "32": "images/icon32.png",
      "48": "images/icon48.png",
      "64": "images/icon64.png",
      "128": "images/icon128.png"
    },
    "default_popup": "options.html",
    "default_title": "Options"
  },
  "options_ui": {
    "page": "options.html"
  },
  "default_locale": "en"
}