Examine source code of SiteTrack

{
  "manifest_version": 2,
  "name": "SiteTrack",
  "version": "1.0.2resigned1",
  "description": "Keeps track of the number of times and the frequency with which you visit specified websites",
  "icons": {
    "48": "icons/icon48.png",
    "64": "icons/icon64.png"
  },
  "permissions": [
    "storage",
    "webNavigation"
  ],
  "background": {
    "page": "background.html"
  },
  "options_ui": {
    "page": "options/options.html"
  },
  "browser_action": {
    "default_icon": "icons/icon64.png",
    "default_title": "SiteTrack",
    "default_popup": "popup/popup.html"
  },
  "web_accessible_resources": [
    "redirect.html"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{67696e9e-4887-42c5-b8c6-0f6bb6197e57}"
    }
  }
}