Examine source code of Gray Visited Links

{
  "manifest_version": 2,
  "name": "Gray Visited Links",
  "version": "0.1.5resigned1",
  "description": "Colors visited links in gray.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "author": "Rotem Dan",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "css": [
        "grayvisitedlinks.css"
      ],
      "run_at": "document_start",
      "all_frames": true
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6382c14-708d-4c81-9ce5-eb40f5ed604e}"
    }
  }
}