Examine source code of Aether extension

{
  "icons": {
    "16": "icon16.plasmo.2577fc03.png",
    "32": "icon32.plasmo.d583dc1e.png",
    "48": "icon48.plasmo.e0fcfb1d.png",
    "64": "icon64.plasmo.e6259081.png",
    "128": "icon128.plasmo.96a1ede9.png"
  },
  "manifest_version": 3,
  "action": {
    "default_icon": {
      "16": "icon16.plasmo.2577fc03.png",
      "32": "icon32.plasmo.d583dc1e.png",
      "48": "icon48.plasmo.e0fcfb1d.png",
      "64": "icon64.plasmo.e6259081.png",
      "128": "icon128.plasmo.96a1ede9.png"
    },
    "default_popup": "popup.html"
  },
  "version": "1.3.3",
  "author": "Aether",
  "name": "Aether extension",
  "description": "Enhance your streaming experience with just one click",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "declarativeNetRequest",
    "activeTab",
    "cookies"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "movie-web.339b95da.js"
      ],
      "css": []
    }
  ],
  "optional_host_permissions": [
    "<all_urls>"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "aether-extension@aether.mom"
    }
  },
  "web_accessible_resources": [
    {
      "resources": [
        "assets/active.png",
        "assets/inactive.png"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}