Examine source code of Text Encryptor

{
  "manifest_version": 2,
  "name": "Text Encryptor",
  "version": "1.11",
  "description": "__MSG_extensionDescription__",
  "author": "Pixelcode",
  "homepage_url": "https://codeberg.org/pixelcode/TextEncryptor",
  "browser_specific_settings": {
    "gecko": {
      "id": "textencryptor@pixelcode.none"
    }
  },
  "icons": {
    "48": "img/icon.png"
  },
  "browser_action": {
    "default_icon": "img/icon.png",
    "default_title": "Text Encryptor",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage"
  ],
  "default_locale": "en"
}