Examine source code of Text Expander

{
  "name": "Text Expand",
  "short_name": "Text Expand",
  "version": "0.0.1",
  "manifest_version": 2,
  "description": "Easily expand your text with shortcuts like",
  "icons": {
    "128": "images/logo/icon.svg"
  },
  "default_locale": "en",
  "background": {
    "scripts": [
      "js/constants.js",
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "38": "images/logo/icon.svg"
    },
    "default_title": "Show configuration"
  },
  "options_ui": {
    "page": "options.html"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/third_party/jquery-3.4.1.min.js",
        "js/third_party/moment-with-locales.min.js",
        "js/constants.js",
        "js/expander.js"
      ],
      "run_at": "document_start"
    }
  ],
  "permissions": [
    "tabs",
    "storage",
    "unlimitedStorage",
    "<all_urls>",
    "clipboardRead"
  ],
  "optional_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "textexpand@extensions.tiagorangel.com",
      "strict_min_version": "42.0"
    }
  }
}