Examine source code of Fast Tab Switcher

{
  "applications": {
    "gecko": {
      "id": "tabswitcher@volinsky.net"
    }
  },
  "browser_action": {
    "default_icon": "icons/icon64.png",
    "default_title": "Open \"Fast Tab Switcher\" popup",
    "default_area": "tabstrip",
    "default_popup": "tab_switcher/switcher.html"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "commands": {
    "_execute_browser_action": {
      "suggested_key": {
        "default": "Ctrl+Space",
        "mac": "MacCtrl+Space"
      },
      "description": "Open \"Fast Tab Switcher\" popup"
    }
  },
  "background": {
    "scripts": [
      "tab_switcher/background.js"
    ]
  },
  "icons": {
    "32": "icons/icon.png",
    "64": "icons/icon64.png"
  },
  "manifest_version": 2,
  "name": "Fast Tab Switcher",
  "permissions": [
    "tabs",
    "sessions"
  ],
  "version": "2.7.0"
}