Examine source code of D2e Card Viewer

{
  "manifest_version": 2,
  "name": "D2e Card Viewer",
  "description": "Adds card images when it finds card names from the Descent 2nd Edition game.",
  "version": "3.1.1",
  "web_accessible_resources": [
    "icon-32.png"
  ],
  "content_scripts": [
    {
      "matches": [
        "*://*.fantasyflightgames.com/*",
        "*://*.boardgamegeek.com/*",
        "*://*.reddit.com/r/JourneysInTheDark/*",
        "*://*.roll20.net/*",
        "*://*.descent2e.fandom.com/*",
        "*://*.descent-community.org/*",
        "*://any2cards.github.io/d2e/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "https://raw.githubusercontent.com/*"
  ],
  "browser_action": {
    "default_icon": {
      "32": "icon-32.png",
      "48": "icon-48.png",
      "128": "icon-128.png"
    }
  }
}