Examine source code of UrlDeToUs

{
  "applications": {
    "gecko": {
      "id": "{8342fad8-78cf-4662-a6e1-bd10a2da9d37}",
      "strict_min_version": "42.0"
    }
  },
  "name": "UrlDeToUs",
  "description": "Adds a button for pages with an URL containing '/de-de/', '/de_de/' or '/de/' which tries to open the en-us version of that URL",
  "manifest_version": 2,
  "version": "1.3resigned1",
  "permissions": [
    "activeTab",
    "tabs",
    "webRequest",
    "webRequestBlocking",
    "storage",
    "<all_urls>"
  ],
  "icons": {
    "48": "icons/translate-48.png"
  },
  "background": {
    "scripts": [
      "changeUrl.js"
    ]
  },
  "page_action": {
    "default_icon": {
      "16": "icons/translate-16.png",
      "32": "icons/translate-32.png"
    },
    "browser_style": true
  },
  "options_ui": {
    "page": "options.html"
  }
}