Examine source code of FoxDirb

{
  "browser_action": {
    "browser_style": true,
    "default_title": "FoxDirb",
    "default_popup": "changepage.html",
    "default_icon": {
      "19": "icons/icon19.png",
      "38": "icons/icon38.png"
    }
  },
  "description": "Dirbuster tool",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "*://*/*",
    "<all_urls>",
    "tabs"
  ],
  "icons": {
    "48": "icons/icon48.png",
    "96": "icons/icon96.png"
  },
  "manifest_version": 2,
  "name": "FoxDirb",
  "version": "2.3resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8fe07fc7-106e-4055-a97c-b261076960de}"
    }
  }
}