Reload on Focus

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 2,
  "name": "Reload on Focus",
  "version": "1.0",
  "description": "Reload a tab whenever it receives the focus.",
  "minimum_chrome_version": "51.0",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "rof-content.js"
      ],
      "run_at": "document_start"
    }
  ],
  "background": {
    "scripts": [
      "rof-background.js"
    ]
  },
  "options_ui": {
    "page": "rof-options.html",
    "chrome_style": false,
    "open_in_tab": true
  },
  "browser_action": {
    "default_icon": "icons/rof-off-512x512.png"
  }
}