Examine source code of SchnapperPlus

{
  "manifest_version": 2,
  "name": "SchnapperPlus",
  "version": "2.9resigned1",
  "description": "Übergibt Artikel von Firefox an SchnapperPlus",
  "icons": {
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "contextMenus",
    "activeTab"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "icons/icon48.png",
    "default_title": "SchnapperPlus"
  },
  "background": {
    "scripts": [
      "content_scripts/schnapperplusOverlay.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dc0882f8-2dd9-4a97-84a9-da006d8a0eac}"
    }
  }
}