Examine source code of syncpacket

{
  "name": "syncpacket",
  "version": "0.0.10",
  "description": "syncpacket is a sync application for syncing your browsers bookmarks,links and notes",
  "author": "shayan yazdanpanah<shayanypn@gmail.com>",
  "manifest_version": 2,
  "default_locale": "en",
  "icons": {
    "16": "assets/icons/icon-16x16.png",
    "48": "assets/icons/icon-48x48.png",
    "128": "assets/icons/icon-128x128.png"
  },
  "chrome_url_overrides": {
    "newtab": "newtab/index.html"
  },
  "content_scripts": [
    {
      "matches": [
        "http://api.syncpacket.com/*",
        "https://api.syncpacket.com/*"
      ],
      "js": [
        "content/content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background/background.js"
    ]
  },
  "permissions": [
    "http://api.syncpacket.com/*",
    "https://api.syncpacket.com/*",
    "tabs",
    "storage",
    "bookmarks",
    "topSites",
    "unlimitedStorage"
  ],
  "browser_action": {
    "default_icon": {
      "16": "assets/icons/icon-16x16.png",
      "19": "assets/icons/icon-19x19.png",
      "38": "assets/icons/icon-38x38.png",
      "128": "assets/icons/icon-128x128.png"
    },
    "default_title": " "
  },
  "applications": {
    "gecko": {
      "id": "syncpacket-firefox@syncpacket.com"
    }
  }
}