Ping DOM element

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Ping DOM element",
  "description": "This extension is rendering a green button if the given DOM element available on the specified URL and red one when it is not.",
  "version": "0.2.7",
  "author": "Peter Kiss <[email protected]>",
  "icons": {
    "19": "src/main/icons/idle.png",
    "48": "src/main/icons/icon48.png",
    "128": "src/main/icons/icon128.png"
  },
  "permissions": [
    "http://*/",
    "https://*/",
    "alarms"
  ],
  "browser_action": {
    "default_icon": "src/main/icons/idle.png",
    "default_title": "Site checker",
    "default_popup": "src/main/popup.html"
  },
  "background": {
    "persistent": false,
    "page": "src/main/background.html"
  },
  "web_accessible_resources": [
    "src/main/icons/*.png",
    "src/main/js/*.js",
    "src/main/*.html"
  ],
  "offline_enabled": false
}