Examine source code of Justify It

{
  "manifest_version": 3,
  "name": "__MSG_extensionName__",
  "version": "1.0.16",
  "description": "__MSG_extensionDescription__",
  "author": "Daniel Rozenberg",
  "homepage_url": "https://github.com/danielrozenberg/justify-it",
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg"
  },
  "permissions": [
    "activeTab",
    "scripting",
    "storage"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.mjs"
    ]
  },
  "commands": {
    "_execute_page_action": {
      "suggested_key": {
        "default": "Alt+J"
      },
      "description": "__MSG_commandDescription__"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*"
      ],
      "js": [
        "content.mjs"
      ],
      "run_at": "document_start"
    }
  ],
  "page_action": {
    "default_icon": "icons/icon.svg",
    "default_title": "__MSG_pageActionDefaultTitle__",
    "show_matches": [
      "*://*/*"
    ]
  },
  "options_ui": {
    "page": "options.html"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "justify-it@firefox.danielrozenberg.com",
      "strict_min_version": "125.0"
    },
    "gecko_android": {
      "strict_min_version": "125.0"
    }
  }
}