Salesforce select all function for FLS setup

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Salesforce select all function for FLS setup",
  "version": "1.0",
  "manifest_version": 2,
  "description": "This extension helps Salesforce Admins to select all columns while setting up field level permissions.",
  "icons": {
    "16": "select_all_16.png",
    "48": "select_all_48.png",
    "128": "select_all_128.png"
  },
  "browser_action": {
    "default_icon": "select_all_16.png",
    "default_title": "Salesforce select all function for FLS setup"
  },
  "permissions": [
    "https://*.salesforce.com/setup/layout/flsedit*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.salesforce.com/setup/layout/flsedit*"
      ],
      "js": [
        "script.js"
      ]
    }
  ]
}