---
title: "Website Responsiveness Checker – Chrome extension stats, history and permissions"
description: "5,000 users, rated 3.75 by 4 people. Version 1.0.1, updated 2023-02-09. Requests 1 permission."
url: "https://extensiontracker.com/extension/ejjphpnidnfhkheelhemnlmgghpfcdoi"
---

# Website Responsiveness Checker

Live in the Chrome Web Store.

- Users: 5,000
- Rating: 3.75 from 4 ratings
- Last checked: 2026-11-06 15:12 UTC
- Users gained in 7 days: No change
- Users gained in 30 days: No change (+0.0%)
- Rank by users: #10,132 of 292,125 live extensions
- Rank in Developer Tools: #904 of 30,444

## The listing

What the Chrome Web Store shows, as of the last check.

Summary from the listing:

> Optimize your website for all devices with website responsiveness checker

- Extension ID: `ejjphpnidnfhkheelhemnlmgghpfcdoi`
- Developer: [websiteresponsive1234](https://extensiontracker.com/developer/uf814a96469459c109ac0967576673e99)
- Enhanced Safe Browsing: Trusted ([what this means](https://extensiontracker.com/enhanced-safe-browsing))
- Category: [Productivity › Developer Tools](https://extensiontracker.com/category/productivity/developer)
- First published: 2023-02-07
- Last updated: 2023-02-09
- Version: `1.0.1`
- Size: 149 KiB
- Minimum Chrome: 88
- Languages (1): English
- Chrome Web Store: <https://chromewebstore.google.com/detail/website-responsiveness-ch/ejjphpnidnfhkheelhemnlmgghpfcdoi>
- View its code or download CRX: <https://crxpeek.com/extension/ejjphpnidnfhkheelhemnlmgghpfcdoi>
- Search Google for the ID: <https://www.google.com/search?q=%22ejjphpnidnfhkheelhemnlmgghpfcdoi%22&tbs=li:1>

## Users over time

One row per check, newest first, as shown on the Chrome Web Store.

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-11-06 | 5,000 | 3.75 | 4 |
| 2026-10-31 | 5,000 | 3.75 | 4 |
| 2026-10-23 | 5,000 | 3.75 | 4 |
| 2026-10-16 | 5,000 | 3.75 | 4 |
| 2026-10-09 | 5,000 | 3.75 | 4 |
| 2026-10-01 | 5,000 | 3.75 | 4 |
| 2026-09-27 | 5,000 | 3.75 | 4 |

## What changed

Every change found on a check, newest first.

No changes found since tracking began on 2026-09-27.

## Developer history

Moves to another publisher account and new contact emails, newest first.

No move to another account and no new contact email since tracking began on 2026-09-27.

We know contact emails only by a keyed hash, so they're never shown. Recent changes: [Account and contact changes](https://extensiontracker.com/owners/).

## What it can access

From the extension's manifest, in plain language.

**Every website:** it can read and change your data on all the sites you visit.

### Sites where it runs scripts

- `<all_urls>`: Every website

### Browser features

- `windows`: Manage browser windows

## More from this developer

Other extensions from the same publisher account.

| Extension | Users | Rating | Ratings | Category |
| --- | ---: | ---: | ---: | --- |
| [YouTube AdBlocker For Chrome](https://extensiontracker.com/extension/lebnkaaedkgdkehefajefkegjdcocbek) | 63 | – | – | Workflow & Planning |

All 2 extensions by [websiteresponsive1234](https://extensiontracker.com/developer/uf814a96469459c109ac0967576673e99).

## About this data

Collected from the extension's public Chrome Web Store listing. It's checked every week, because it has 1,000 or more users, and again whenever a new version appears. Last checked 2026-11-06 15:12 UTC; next check around 2026-11-14.

How the data is collected: <https://extensiontracker.com/methodology>.

## Cite this page

Extension Tracker. “Website Responsiveness Checker” (ejjphpnidnfhkheelhemnlmgghpfcdoi). Chrome Web Store data, last checked 2026-11-06. https://extensiontracker.com/extension/ejjphpnidnfhkheelhemnlmgghpfcdoi. Accessed 2026-11-13.

```bibtex
@misc{extensiontracker_ejjphpnidnfhkheelhemnlmgghpfcdoi,
  title   = {Website Responsiveness Checker (ejjphpnidnfhkheelhemnlmgghpfcdoi)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-11-06},
  url     = {https://extensiontracker.com/extension/ejjphpnidnfhkheelhemnlmgghpfcdoi},
  urldate = {2026-11-13}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/ejjphpnidnfhkheelhemnlmgghpfcdoi>. It isn't affiliated with Google. The data is free to reuse under CC BY 4.0 (<https://creativecommons.org/licenses/by/4.0/>), crediting Extension Tracker. Every page except search comes as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.