Examine source code of GcalColor

{
  "manifest_version": 2,
  "name": "GcalColor",
  "description": "Colorize events in the new Google Calendar. (Keywords: Gcal color colors event)",
  "version": "0.32resigned1",
  "author": "Alan deLespinasse",
  "homepage_url": "https://github.com/adelespinasse/gcalcolor",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://calendar.google.com/calendar*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{ea2d1233-9f0f-4687-95c2-0e43feb0c7d5}"
    }
  }
}