Examine source code of Ecri+ Helper

{
  "manifest_version": 3,
  "name": "Ecri+ Helper",
  "version": "1.0",
  "description": "Ecri+ UI upgrade",
  "browser_specific_settings": {
    "gecko": {
      "id": "@ecriplus-helper.samuel-carel.com",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [],
  "host_permissions": [
    "https://app.tests.ecriplus.fr/*",
    "https://api.tests.ecriplus.fr/*"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.tests.ecriplus.fr/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ]
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "inject.js"
      ],
      "matches": [
        "https://app.tests.ecriplus.fr/*"
      ]
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}