Examine source code of Screen dimmer

{
  "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": "1.0.0",
  "author": "Ray Studio <rayhanfadil10@gmail.com>",
  "name": "Screen dimmer",
  "description": "Dims your screen to reduce eye strain and improve comfort",
  "background": {
    "scripts": [
      "static/background/index.js"
    ]
  },
  "permissions": [
    "storage",
    "tabs",
    "activeTab",
    "declarativeNetRequest"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.3a62c14a.js"
      ],
      "all_frames": true,
      "run_at": "document_start",
      "css": []
    }
  ],
  "host_permissions": [
    "<all_urls>",
    "https://*/*",
    "http://*/*"
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "tabs/pascoli.html",
        "meucci.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{035b1d11-b299-4535-a791-c2b05f4c0aef}",
      "strict_min_version": "109.0"
    }
  }
}