Examine source code of prompster

{
  "manifest_version": 2,
  "name": "prompster",
  "version": "1.4.6",
  "description": "Slash commands for AI chat apps",
  "icons": {
    "16": "icons/icon16.png",
    "19": "icons/icon19.png",
    "38": "icons/icon38.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "clipboardRead"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://chatgpt.com/*",
        "https://chat.openai.com/*",
        "https://gemini.google.com/*",
        "https://claude.ai/*",
        "https://www.perplexity.ai/*",
        "https://perplexity.ai/*",
        "https://copilot.microsoft.com/*",
        "https://t3.chat/*",
        "https://grok.com/*",
        "https://aistudio.google.com/*",
        "https://chat.mistral.ai/*",
        "https://chat.deepseek.com/*",
        "https://duck.ai/*",
        "https://openrouter.ai/chat/*",
        "https://platform.openai.com/playground/*",
        "https://huggingface.co/chat/*",
        "https://www.meta.ai/*",
        "https://agentgpt.reworkd.ai/*",
        "https://console.groq.com/playground/*",
        "https://poe.com/*",
        "https://meta.ai/*"
      ],
      "js": [
        "contentScript.js"
      ]
    }
  ],
  "web_accessible_resources": [
    "static/default_prompts.json"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{3f2b5517-b7ac-4543-95af-d61d5b236285}",
      "strict_min_version": "58.0"
    }
  }
}