Examine source code of Handy Switcher FE/BE/Env/TYPO3

{
  "manifest_version": 2,
  "author": "wolo.pl '.' studio",
  "homepage_url": "https://wolo.pl/handyswitcher/",
  "applications": {
    "gecko": {
      "id": "handyswitcher@wolo.pl"
    }
  },
  "name": "TYPO3 - BE/FE/Env Handy Switcher",
  "short_name": "TYPO3 Switcher",
  "description": "Switches between Frontend / Backend and work environments on your TYPO3 projects. Preserves page path and base url.",
  "version": "2.2.594",
  "browser_action": {
    "default_icon": "Icons/icon-48.png",
    "default_title": "TYPO3 - switch Backend-Frontend (right click: Environment switch)"
  },
  "icons": {
    "16": "Icons/icon-16.png",
    "32": "Icons/icon-32.png",
    "48": "Icons/icon-48.png",
    "128": "Icons/icon-128.png"
  },
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "page": "options.html",
    "chrome_style": true,
    "open_in_tab": true
  },
  "permissions": [
    "activeTab",
    "tabs",
    "storage",
    "contextMenus"
  ],
  "optional_permissions": [
    "*://*/*"
  ]
}