Examine source code of Zend Debugger Button

{
  "manifest_version": 2,
  "name": "Zend Debugger Button",
  "short_name": "ZDButton",
  "version": "0.5resigned1",
  "author": "Roman Basayev",
  "homepage_url": "https://github.com/rbZend/ZDButton_FF",
  "description": "Launches basic Zend Debugger commands",
  "icons": {
    "48": "icons8-bug-48.png",
    "96": "icons8-bug-96.png"
  },
  "permissions": [
    "tabs",
    "cookies",
    "storage",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons8-bug-32.png",
    "default_title": "Zend Debugger Button",
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4d89f064-8b75-4ea5-b2e9-1d832668475a}"
    }
  }
}