Wordcounter

manifest.json

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Wordcounter",
  "version": "1.3",
  "description": "Displays a real-time word count while writing in Google Docs, as well as milestone markers every 500 words.",
  "permissions": [
    "activeTab",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "https://docs.google.com/*"
      ],
      "css": [
        "style.css"
      ],
      "js": [
        "jquery-3.3.1.min.js",
        "content.js"
      ]
    }
  ],
  "browser_action": {
    "name": "Click to toggle Wordcounter on or off"
  },
  "icons": {
    "128": "icon.png"
  },
  "manifest_version": 2
}