Examine source code of Reddit Theme Studio

{
  "name": "Reddit Theme Studio",
  "version": "0.0.3",
  "description": "A browser extension for creating custom Reddit themes using HTML and CSS",
  "homepage_url": "https://github.com/dan-lovelace/reddit-theme-studio",
  "manifest_version": 2,
  "icons": {
    "16": "img/logo_16.png",
    "48": "img/logo_48.png",
    "128": "img/logo_128.png",
    "256": "img/logo_256.png",
    "512": "img/logo_512.png"
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://*.reddit.com/*"
      ],
      "css": [
        "main.css"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "webRequest",
    "webRequestBlocking",
    "https://*.reddit.com/*",
    "https://www.redditstatic.com/*"
  ],
  "web_accessible_resources": [
    "img/*",
    "sandbox.html"
  ],
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "temporary@addon.com"
    }
  }
}