Examine source code of GamesGraph

{
  "manifest_version": 2,
  "name": "GamesGraph",
  "version": "26.4",
  "description": "Add games to your GamesGraph collections directly from Steam store pages. Display current deals and historical lows.",
  "permissions": [
    "storage",
    "https://www.gamesgraph.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://store.steampowered.com/app/*"
      ],
      "js": [
        "extension-bridge.js",
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    },
    {
      "matches": [
        "https://www.gamesgraph.com/*"
      ],
      "js": [
        "extension-bridge.js",
        "settings-sync.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "icon.png"
  ],
  "icons": {
    "16": "icon.png",
    "48": "icon.png",
    "96": "icon.png",
    "128": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "extension@gamesgraph.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}