Examine source code of Auto promoter

{
  "background": {
    "persistent": true,
    "scripts": [
      "scripts/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "128": "assets/icon128.png"
    },
    "default_popup": "popup.html"
  },
  "content_scripts": [
    {
      "js": [
        "assets/libs/jquery-3.3.1.min.js",
        "scripts/content-scripts.js"
      ],
      "matches": [
        "*://*.ebay.com/*"
      ],
      "all_frames": true
    }
  ],
  "description": "Auto promote bulk sells on ebay",
  "icons": {
    "128": "assets/icon128.png"
  },
  "manifest_version": 2,
  "name": "Auto promoter",
  "permissions": [
    "storage",
    "tabs",
    "https://bulksell.ebay.com/*",
    "https://bulkedit.ebay.com/*"
  ],
  "version": "3",
  "web_accessible_resources": [
    "assets/*"
  ]
}