Examine source code of Spine Align

{
  "description": "This extension will use your webcam to notify you if you are slouching by blurring your screen",
  "version": "10.6",
  "manifest_version": 2,
  "name": "Spine Align",
  "options_page": "options.html",
  "background": {
    "scripts": [
      "background.bundle.js"
    ]
  },
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "AppImage(1)(1).png"
  },
  "icons": {
    "128": "AppImage(1)(1).png"
  },
  "content_scripts": [
    {
      "run_at": "document_end",
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "contentScript.bundle.js"
      ],
      "css": [
        "content.styles.css"
      ]
    }
  ],
  "web_accessible_resources": [
    "content.styles.css",
    "AppImage(1)(1).png"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "realsharkguy@gmail.com",
      "strict_min_version": "88.0"
    }
  }
}