---
title: "WEBM to MP4 converter: WebCodecs and FFmpeg support – Chrome extension stats, history and permissions"
description: "4,000 users, rated 4.32 by 22 people. Version 1.4.0, updated 2025-12-04. Requests 6 permissions."
url: "https://extensiontracker.com/extension/mfjlolbldcokknaeaaphebndgeicolfm"
---

# WEBM to MP4 converter: WebCodecs and FFmpeg support

Live in the Chrome Web Store.

- Users: 4,000
- Rating: 4.32 from 22 ratings
- Last checked: 2026-11-10 20:15 UTC
- Users gained in 7 days: No change
- Users gained in 30 days: No change (+0.0%)
- Rank by users: #11,109 of 292,131 live extensions
- Rank in Tools: #2,683 of 115,641

## The listing

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

Summary from the listing:

> 🎬 Convert WEBM to MP4 instantly and securely. No server uploads, unlimited file conversions, works locally in your browser.

- Extension ID: `mfjlolbldcokknaeaaphebndgeicolfm`
- Developer: [dreambuilder.first](https://extensiontracker.com/developer/u6b374bd3c6cefad888ccd752a423ff06)
- Enhanced Safe Browsing: Trusted ([what this means](https://extensiontracker.com/enhanced-safe-browsing))
- Category: [Productivity › Tools](https://extensiontracker.com/category/productivity/tools)
- First published: 2024-09-30
- Last updated: 2025-12-04
- Version: `1.4.0`
- Size: 10.07 MiB
- Minimum Chrome: 88
- Languages (52): Deutsch, English, Filipino, Indonesia, Kiswahili, Melayu, Nederlands, Tiếng Việt, Türkçe, català, dansk, eesti, español, español (Latinoamérica), français, hrvatski, italiano, latviešu, lietuvių, magyar, norsk, polski, português (Brasil), português (Portugal), română, slovenčina, slovenščina, suomi, svenska, čeština, Ελληνικά, български, русский, српски, українська, עברית, العربية, فارسی, मराठी, हिन्दी, বাংলা, ગુજરાતી, தமிழ், తెలుగు, ಕನ್ನಡ, മലയാളം, ไทย, አማርኛ, 中文（中国）, 中文（台灣）, 日本語, 한국어
- Privacy policy: `https://docs.google.com/document/d/10cQiuVkcKjRn8Zuzl4jVyNEytslPU-RQPQqvubL7ybU/edit?usp=sharing`
- Chrome Web Store: <https://chromewebstore.google.com/detail/webm-to-mp4-converter-web/mfjlolbldcokknaeaaphebndgeicolfm>
- View its code or download CRX: <https://crxpeek.com/extension/mfjlolbldcokknaeaaphebndgeicolfm>
- Search Google for the ID: <https://www.google.com/search?q=%22mfjlolbldcokknaeaaphebndgeicolfm%22&tbs=li:1>

## Users over time

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

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-11-10 | 4,000 | 4.32 | 22 |
| 2026-11-03 | 4,000 | 4.32 | 22 |
| 2026-10-27 | 4,000 | 4.32 | 22 |
| 2026-10-20 | 4,000 | 4.32 | 22 |
| 2026-10-13 | 4,000 | 4.32 | 22 |
| 2026-10-07 | 4,000 | 4.29 | 21 |
| 2026-09-29 | 4,000 | 4.29 | 21 |
| 2026-09-27 | 4,000 | 4.29 | 21 |

## 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

- `<all_urls>`: Every website

### Sites where it runs scripts

- `*://*/*`: Every website
- `<all_urls>`: Every website

### Browser features

- `contextMenus`: Add items to the right-click menu
- `notifications`: Show notifications
- `scripting`: Run scripts on sites it can reach
- `storage`: Save settings and data in your browser
- `tabs`: Read the addresses and titles of your tabs

## More from this developer

Other extensions from the same publisher account.

| Extension | Users | Rating | Ratings | Category |
| --- | ---: | ---: | ---: | --- |
| [Image Resizer](https://extensiontracker.com/extension/fcnojididbadljkpolmpkjckmahfljpb) | 5,000 | 4.82 | 28 | Art & Design |
| [Html2Email: HTML editor and Inserter for Gmail & Yahoo Mail](https://extensiontracker.com/extension/pgdmhodlebnljmmknpicldhgdnllonmd) | 5,000 | 5.00 | 38 | Communication |
| [Full Screen Tabs](https://extensiontracker.com/extension/jkimepglppimjfkagodhndbbphijfdme) | 3,000 | 4.30 | 50 | Functionality & UI |
| [Image Splitter](https://extensiontracker.com/extension/khkhfdckilojgneleiifofcaihjjohpi) | 3,000 | 4.94 | 16 | Art & Design |
| [Html2Email: Send HTML emails from Yandex Mail & Mail.ru](https://extensiontracker.com/extension/abmkpjgehldaifignjmkkclconobcjma) | 1,000 | 4.75 | 12 | Communication |
| [Shortcut Tab Switcher](https://extensiontracker.com/extension/ginpnicoedlafjjkbegdbjaepemklnge) | 1,000 | 4.71 | 17 | Functionality & UI |
| [Favorite Emojis Copy Popup](https://extensiontracker.com/extension/mdcdbchlplajhidmkjlojbhpmlileodo) | 498 | 4.50 | 8 | Functionality & UI |
| [Homepage Quick Access](https://extensiontracker.com/extension/miicgjocaihoikopcjpdnifedigojhog) | 338 | 4.33 | 6 | Tools |
| [Blur Rabbit – Blur screen PII for privacy](https://extensiontracker.com/extension/aocbmafnmbcpoapldickjlmicnammjod) | 70 | 5.00 | 2 | Privacy & Security |
| [Cursorex - Chat with Cursor](https://extensiontracker.com/extension/infbgmlkjfimojcjikknabbaifbafjoo) | 70 | – | – | Workflow & Planning |

All 13 extensions by [dreambuilder.first](https://extensiontracker.com/developer/u6b374bd3c6cefad888ccd752a423ff06).

## 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 2026-11-10 20:15 UTC; next check around 2026-11-18.

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

## Cite this page

Extension Tracker. “WEBM to MP4 converter: WebCodecs and FFmpeg support” (mfjlolbldcokknaeaaphebndgeicolfm). Chrome Web Store data, last checked 2026-11-10. https://extensiontracker.com/extension/mfjlolbldcokknaeaaphebndgeicolfm. Accessed 2026-11-13.

```bibtex
@misc{extensiontracker_mfjlolbldcokknaeaaphebndgeicolfm,
  title   = {WEBM to MP4 converter: WebCodecs and FFmpeg support (mfjlolbldcokknaeaaphebndgeicolfm)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-11-10},
  url     = {https://extensiontracker.com/extension/mfjlolbldcokknaeaaphebndgeicolfm},
  urldate = {2026-11-13}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/mfjlolbldcokknaeaaphebndgeicolfm>. 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`.