Chrome extension (Manifest V3) that detects whether the current page runs on Next.js and shows the exact version (e.g. v14.2.3) — passively, on every page load.
Install from the Chrome Web Store — published Dec 2025, currently 69 users · 4.7/5 (3 ratings) as of Sep 19, 2026.
- Clone or download this repository.
- Open Chrome and go to
chrome://extensions. - Enable Developer mode (toggle in the top-right corner).
- Click Load unpacked and select the extension directory.
- Passive Detection: automatically detects Next.js on every page load — no clicking required.
- Version Detection: extracts and displays the exact Next.js version (e.g.,
v14.2.3). - Visual Feedback: black 'N' icon when Next.js is detected, gray when not.
- Popup Info: shows "Next.js Detected" and the version in a clean popup.
- Injection: a small script (
inject.js) is injected into the page's main context (Main World). - Detection: it checks for
window.next.version. - Communication: the version is sent via
window.postMessageto the content script, which forwards it to the background script. - Storage: the background script updates the icon state and stores the version in
chrome.storage.local. - Display: the popup reads the stored version and displays it.
activeTab— to access the current tab's IDscripting— to inject the detection scriptstorage— to persist the detected version for the popup
Detection runs entirely on your machine: the extension reads window.next.version from the current tab and stores the result locally. Nothing is transmitted, logged, or uploaded. Full policy: PRIVACY_POLICY.md.
See LICENSE.