Uncheck Stay signed in Yahoo Login

manifest.json

{
  "manifest_version": 2,
  "name": "Uncheck Stay-signed-in for Yahoo Login",
  "description": "Uncheck Stay signed in automatically for Yahoo Login",
  "version": "2.1resigned1",
  "author": "backy0175",
  "icons": {
    "32": "yahoo_32x32.png",
    "48": "yahoo_48x48.png",
    "64": "yahoo_64x64.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://login.yahoo.com/*",
        "*://login.yahoo.co.jp/*"
      ],
      "js": [
        "script.js"
      ]
    }
  ],
  "options_ui": {
    "page": "options.html"
  },
  "permissions": [
    "storage"
  ],
  "applications": {
    "gecko": {
      "id": "@uncheck-stay-signed-in-for-yahoo-login",
      "strict_min_version": "42.0"
    }
  }
}