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manifest.json

{
  "manifest_version": 3,
  "name": "Open in Steam",
  "description": "Adds scrolling [Open in Steam] button on Steam pages.",
  "version": "1.0",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "64": "icons/64.png",
    "128": "icons/128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.steampowered.com/*",
        "*://steamcommunity.com/*"
      ],
      "js": [
        "script.js"
      ],
      "css": [
        "stylesheet.css"
      ],
      "run_at": "document_end"
    }
  ],
  "update_url": "https://edge.microsoft.com/extensionwebstorebase/v1/crx"
}