Tablockify

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Tablockify",
  "version": "4",
  "description": "Prevent your tab to be closed or reloaded",
  "background": {
    "scripts": [
      "js/background.js"
    ]
  },
  "icons": {
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "js/lock.js"
      ]
    }
  ],
  "manifest_version": 2,
  "permissions": [
    "http://*/",
    "https://*/",
    "tabs",
    "contextMenus"
  ]
}