Examine source code of oNiko

{
  "manifest_version": 3,
  "name": "oNiko",
  "version": "2.7",
  "description": "Adds Niko that follows your mouse (Sprites from OneShot)",
  "icons": {
    "96": "img/icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2ea00bce-721c-4843-9b62-91a8f3e358e0}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "lib/browser-polyfill.js",
        "scripts/content.js",
        "scripts/health.js",
        "scripts/utils.js",
        "scripts/projectiles.js"
      ]
    }
  ],
  "background": {
    "type": "module",
    "scripts": [
      "scripts/background.js"
    ]
  },
  "permissions": [
    "storage"
  ],
  "action": {
    "default_icon": "img/icon.png",
    "default_popup": "options/options.html"
  },
  "web_accessible_resources": [
    {
      "resources": [
        "img/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ]
}