Examine source code of SSFeatures

{
  "manifest_version": 3,
  "name": "SSFeatures",
  "version": "1.1.0",
  "author": "Nathan Braun",
  "description": "Add new features into Smartsheet to improve your productivity.",
  "action": {
    "default_title": "SSFeatures",
    "default_icon": {
      "16": "icons/logo-16.png",
      "24": "icons/logo-24.png",
      "32": "icons/logo-32.png"
    },
    "default_popup": "javascript/popup/index.html"
  },
  "icons": {
    "16": "icons/logo-16.png",
    "32": "icons/logo-32.png",
    "48": "icons/logo-48.png",
    "128": "icons/logo-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://app.smartsheet.com/*",
        "https://app.smartsheet.eu/*",
        "https://app.smartsheetgov.com/*",
        "https://workapps.smartsheet.com/*",
        "https://workapps.smartsheet.eu/*"
      ],
      "js": [
        "javascript/contentscript/content-script-main.js"
      ],
      "run_at": "document_start"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "javascript/webpage/webpage-main.js",
        "css/*"
      ],
      "matches": [
        "<all_urls>",
        "https://app.smartsheet.com/*",
        "https://app.smartsheet.eu/*",
        "https://app.smartsheetgov.com/*",
        "https://workapps.smartsheet.com/*",
        "https://workapps.smartsheet.eu/*"
      ]
    }
  ],
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://app.smartsheet.com/*",
    "https://app.smartsheet.eu/*",
    "https://app.smartsheetgov.com/*",
    "https://workapps.smartsheet.com/*",
    "https://workapps.smartsheet.eu/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "ssfeatures@ssfeatures.com",
      "strict_min_version": "113.0"
    },
    "gecko_android": {}
  }
}