Examine source code of Eye Scroll

{
  "manifest_version": 2,
  "name": "Eye Scroll",
  "version": "1.0",
  "description": "Scroll webpages by looking at the top or bottom of the screen using eye tracking",
  "browser_specific_settings": {
    "gecko": {
      "id": "eye-scroll@extension",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "permissions": [
    "storage",
    "activeTab",
    "tabs",
    "<all_urls>",
    "webRequest",
    "webRequestBlocking"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end",
      "all_frames": false
    }
  ],
  "web_accessible_resources": [
    "webgazer.js",
    "tracker.js"
  ]
}