Blocker

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Blocker",
  "version": "1.0",
  "description": "You should be working hard!",
  "permissions": [
    "webRequest",
    "webRequestBlocking",
    "tabs",
    "http://*/*",
    "https://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    "*.html"
  ],
  "manifest_version": 2
}