@rmeinl/crx-hotreload-no-page-refresh/manifest.json

Watches for file changes in your Chrome extension's directory. When a change is detected, it reloads the extension and refreshes the active tab (to re-trigger the updated scripts).

{
    "manifest_version": 1,

    "name":        "Chrome Extension Hot Reloader EXAMPLE",
    "description": "An example extension which demonstrates hot-reloading",
    "version":     "1.0.0",

    "background": {
        "scripts": ["hot-reload.js"]
    }
}