Examine source code of Ebay helper

{
  "manifest_version": 2,
  "name": "Ebay helper",
  "version": "1.4",
  "description": "This addon helps to manage ebay saved feeds ",
  "icons": {
    "48": "icons/ebay-icon-1-48.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab",
    "tabs"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.ebay.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  }
}