Examine source code of Easy SEO

{
  "manifest_version": 2,
  "name": "Easy SEO",
  "version": "1.0",
  "description": "Analyze headings, images, links, title and metadescription. This extension look for any error from a SEO point of view.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jquery-3.4.1.min.js",
        "content.js"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_icon": "icon.png"
  }
}