Save in iCalendar file

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Save in iCalendar file",
  "description": "This extension loads the data on weekends and holidays in the format iCalendar.",
  "icons": {
    "128": "128.png"
  },
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "version": "1.0",
  "content_scripts": [
    {
      "matches": [
        "http://calendar.by/*"
      ],
      "js": [
        "js/content.js"
      ]
    }
  ],
  "page_action": {
    "default_name": "Save to iCalendar",
    "default_icon": "128.png",
    "default_popup": "iCalendar.html"
  },
  "permissions": [
    "activeTab",
    "tabs",
    "http://calendar.by/*",
    "https://calendar.by/*"
  ]
}