Is WEBM to MP4 converter: WebCodecs and FFmpeg support safe?

Low risk

The extension adds buttons beside WEBM links and fetches a Google Sheets promo feed in its converter UI.

WEBM to MP4 converter runs content scripts on all sites to find links ending in .webm, then opens the selected file URL inside its WebCodecs or FFmpeg converter page when you click its button. Its converter pages also request a Google Sheets feed to show cross-promotion messages in the extension UI.

Part of this rating comes from analysis signals we haven't published as detailed findings yet.

dreambuilder.firstv1.4.0Chrome Web Store
18Risk
Who publishes it

dreambuilder.first - 3 other listings from the same operator, none carrying a finding

What this publisher told the store about itself, and the other listings that told it the same thing.

Publisher
dreambuilder.first

Same store account

3 other listings published from this account, 14k+ users between them, none of them carrying a finding.

Shared hosts - 2 hostnames

Hostnames hardcoded in this extension that few other listings call. That can mean one operator behind both, and it can equally mean a small shared vendor, so it is context rather than a conclusion. Hosts that many listings call are left out: they are services, not connections.

remotion.pro
Also called by 1 other listing: InstantDocs - Create How-To Videos and Docs In Minutes
remotion.dev
Also called by 5 other listings, including InstantDocs - Create How-To Videos and Docs In Minutes

AI-generated. Findings may contain errors. Those marked Verified have been manually reviewed.

Publishers can request a review.

What it can do

Permissions this extension asks for, as declared in version 1.4.0. Asking for a permission is not a finding on its own - it is what the extension can do if it chooses to.

  • Read and change your data on every site you visit

    <all_urls>

  • See the address and title of every tab you have open

    tabs

  • Run its own code inside the pages you visit

    scripting

  • Show you desktop notifications

    notifications

  • Store data in your browser

    storage

  • Add items to the right-click menu

    contextMenus

Where it sends data

Destinations our analysis observed WEBM to MP4 converter: WebCodecs and FFmpeg support contacting. Sending data somewhere is not a finding on its own - an extension that syncs your settings has to talk to its own server - but it is where your data can go, and who else it goes to.

  • docs.google.com

    WEBM to MP4 converter: WebCodecs and FFmpeg support sends data to docs.google.com. 20 other extensions we have analysed send data here.

Updated 30 September 2026mfjlolbldcokknaeaaphebndgeicolfm