Examine source code of DeepLT

{
  "name": "DeepLT",
  "version": "2.0.1",
  "description": "A simple translation extension for Firefox powered by DeepL",
  "permissions": [
    "clipboardWrite",
    "menus",
    "storage",
    "notifications",
    "activeTab",
    "<all_urls>"
  ],
  "manifest_version": 2,
  "default_locale": "en",
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{2d7fda62-1b5e-4e2b-96bd-9eed1ee4647a}"
    }
  },
  "browser_action": {
    "default_popup": "popup.html",
    "browser_style": true,
    "default_icon": {
      "16": "images/logo/deeplt-16.png",
      "32": "images/logo/deeplt-32.png",
      "48": "images/logo/deeplt-48.png",
      "128": "images/logo/deeplt-128.png"
    },
    "default_title": "DeepLT"
  },
  "icons": {
    "16": "images/logo/deeplt-16.png",
    "32": "images/logo/deeplt-32.png",
    "48": "images/logo/deeplt-48.png",
    "128": "images/logo/deeplt-128.png"
  },
  "options_ui": {
    "page": "options.html",
    "browser_style": true
  }
}