Examine source code of Auto Text Expander

{
  "name": "__MSG_EXTENSION_NAME__",
  "short_name": "__MSG_EXTENSION_SHORTNAME__",
  "version": "1.9.5.1",
  "manifest_version": 2,
  "description": "__MSG_EXTENSION_DESCRIPTION__",
  "icons": {
    "16": "images/icon16.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "default_locale": "en",
  "omnibox": {
    "keyword": "__MSG_KEYWORD_OMNIBAR_TRIGGER__"
  },
  "background": {
    "scripts": [
      "js/constants.js",
      "js/background.js"
    ]
  },
  "browser_action": {
    "default_icon": {
      "19": "images/icon19.png",
      "38": "images/icon38.png"
    },
    "default_title": "__MSG_BROWSER_ACTION_TITLE__"
  },
  "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>",
    "notifications",
    "clipboardRead"
  ],
  "optional_permissions": [],
  "browser_specific_settings": {
    "gecko": {
      "id": "autotextexpander@example.com",
      "strict_min_version": "42.0"
    }
  }
}