Examine source code of TabSearch

{
  "description": "Search all open Tabs",
  "manifest_version": 2,
  "name": "TabSearch",
  "version": "1.0",
  "browser_action": {
    "browser_style": true,
    "default_popup": "tablist.html",
    "default_icon": {
      "32": "popup.png"
    }
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{71acdf07-84fd-4d94-bb5e-069e949dc597}"
    }
  }
}