Examine source code of scryfall-stream-extension

{
  "manifest_version": 2,
  "name": "scryfall-stream-extension",
  "short_name": "Scryfall-Stream",
  "description": "Provides Magic broadcasters the ability to display card graphics on screen.",
  "version": "1.2.2",
  "author": "Brendan Hagan (haganbmj)",
  "icons": {
    "48": "icon/icon48-2.png",
    "96": "icon/icon96-2.png"
  },
  "applications": {
    "gecko": {
      "id": "{0afa4b8b-ce93-422c-a915-3e97857b9027}"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0afa4b8b-ce93-422c-a915-3e97857b9027}"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.scryfall.com/*"
      ],
      "exclude_globs": [
        "*://api.scryfall.com/*"
      ],
      "js": [
        "browser-polyfill.min.js",
        "scryfall-stream-extension.client.js"
      ],
      "css": [
        "scryfall-stream-extension.client.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_action": {
    "default_icon": {
      "48": "icon/icon48-2.png",
      "96": "icon/icon96-2.png"
    },
    "default_title": "Show panel",
    "browser_style": true,
    "default_popup": "options.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": false
  },
  "permissions": [
    "storage",
    "*://*.streamsgood.com/*"
  ],
  "content_security_policy": "script-src 'self'; object-src 'self'"
}