Examine source code of Post Content Reader

{
  "manifest_version": 3,
  "name": "Post Content Reader",
  "version": "1.1",
  "description": "Reads Reddit and Twitter posts aloud.",
  "permissions": [
    "activeTab",
    "storage",
    "tts"
  ],
  "action": {
    "default_icon": {
      "16": "icons/icon-48.jpg",
      "48": "icons/icon-48.jpg",
      "128": "icons/icon-128.jpg"
    },
    "default_title": "Post Content Reader"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.reddit.com/*",
        "*://*.twitter.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "postreadder@paperwall.tech",
      "strict_min_version": "58.0"
    }
  }
}