Examine source code of BookmarkChecker

{
  "description": "Print the state of all URL in bookmarks who have problems",
  "manifest_version": 2,
  "name": "Checker",
  "version": "0.2resigned1",
  "homepage_url": "https://github.com/darcosion/checker",
  "icons": {
    "48": "icones/icone.png"
  },
  "permissions": [
    "<all_urls>",
    "activeTab",
    "bookmarks"
  ],
  "browser_action": {
    "browser_style": true,
    "default_icon": "icones/icone.png",
    "default_title": "Checker",
    "default_popup": "popup/checker.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{e66ad35f-3c0e-4a24-9921-3311ce43a7b1}"
    }
  }
}