Examine source code of S2S Field Manager

{
  "name": "S2S Field Manager",
  "version": "0.0.7",
  "manifest_version": 2,
  "description": "Sync2Sell Custom Field Manager",
  "homepage_url": "https://sync2sell.com/Extension",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "background": {
    "scripts": [
      "js/jquery/jquery.js",
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_icon": "icons/icon19.png",
    "default_title": "Sync2Sell Custom Field Manager"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "webNavigation",
    "https://*.lightspeedapp.com/*",
    "https://*.merchantos.com/*"
  ],
  "web_accessible_resources": [
    "logo/*.png",
    "logo/*.jpg"
  ],
  "content_scripts": [
    {
      "css": [
        "style.css"
      ],
      "matches": [
        "https://*.lightspeedapp.com/*",
        "https://*.merchantos.com/*"
      ]
    }
  ]
}