Examine source code of Spyglass Search

{
  "name": "Spyglass Search",
  "description": "Sync your bookmarks & add your favorite sites to your Spyglass library",
  "version": "1.1",
  "short_name": "Spyglass",
  "manifest_version": 2,
  "icons": {
    "48": "images/icon_48.png",
    "96": "images/icon_96.png"
  },
  "background": {
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "48": "images/icon_48.png",
      "96": "images/icon_96.png"
    },
    "default_title": "Spyglass Search",
    "default_popup": "pages/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "scripts/contentscript.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "permissions": [
    "activeTab",
    "alarms",
    "bookmarks",
    "history",
    "tabs",
    "storage",
    "nativeMessaging",
    "http://localhost/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{134356c6-7c3c-40ce-905a-be7ded9b41d6}"
    }
  }
}