Examine source code of Ponify Reharmonized

{
  "manifest_version": 3,
  "name": "Ponify Reharmonized",
  "description": "Ponify Reharmonized is a utility replacing all human words with ponified alternatives. Thank you, Ben Ashton.",
  "version": "19.1.16",
  "browser_specific_settings": {
    "gecko": {
      "id": "the@birb.horse",
      "strict_min_version": "115.0"
    },
    "gecko_android": {
      "strict_min_version": "115.0"
    }
  },
  "content_scripts": [
    {
      "include_globs": [
        "*"
      ],
      "run_at": "document_end",
      "js": [
        "src/replace.js"
      ],
      "all_frames": true,
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "action": {
    "default_icon": "img/rh16.png",
    "default_popup": "popup.htm",
    "default_title": "Ponify"
  },
  "icons": {
    "16": "img/rh16.png",
    "48": "img/rh48.png"
  },
  "background": {
    "scripts": [
      "src/init.js",
      "src/background.js"
    ]
  },
  "permissions": [
    "tabs",
    "activeTab"
  ],
  "host_permissions": [
    "<all_urls>"
  ]
}