Examine source code of Auto eBay Feedback

{
  "name": "Auto eBay Feedback",
  "description": "Automatically leaves eBay feedback for all transactions",
  "homepage_url": "https://github.com/milan102/Auto-eBay-Feedback",
  "version": "2.3resigned1",
  "manifest_version": 2,
  "browser_action": {
    "browser_style": true,
    "default_title": "Auto eBay Feedback",
    "default_popup": "popup/ebayfeedback.html",
    "default_icon": "icons/ebay-32.png"
  },
  "icons": {
    "48": "icons/ebay-48.png"
  },
  "permissions": [
    "*://*.ebay.com/*",
    "tabs",
    "storage"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://www.ebay.com/fdbk/leave_feedback",
        "*://feedback.ebay.com/ws/eBayISAPI.dll"
      ],
      "js": [
        "content_scripts/current_leavefeedback.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3dbf2a4a-96cb-497d-8f9e-bc32e9955af9}"
    }
  }
}