Examine source code of Input Case Changer

{
  "manifest_version": 3,
  "name": "Input Case Changer",
  "version": "1.8",
  "description": "Change selected text case in inputs, textareas, WordPress/TinyMCE, and 'contenteditable' fields. Designed by me, pretty much jsut for me. Code written mostly by ChatGPT. If you don't like that, don't install this.",
  "icons": {
    "16": "icons/16.png",
    "32": "icons/32.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "permissions": [
    "menus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "input-case-changer@petercharlton.com.au",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}