CatBlock: first ad-blocker for Microsoft Edge

Martin Brinkmann
May 3, 2016
Updated • Jul 5, 2017
Internet Explorer, Microsoft Edge

CatBlock is the name of the first ad-blocking extension for the Microsoft Edge web browser that has just been released as an alpha version.

Experimental extensions support for Microsoft Edge is currently being tested on the Windows 10 Insider Channel. Microsoft plans to make extensions available to Microsoft Edge running on stable versions of Windows 10 later this year.

Since the feature is currently in preview, only a handful of extensions are provided and those mostly to showcase the functionality of the extensions engine.

At least some developers are working on porting their extensions to Microsoft Edge which is a lot easier thanks to similarities between Edge's extensions functionality and that of Google Chrome, than it was to port extensions to Internet Explorer.


adblock microsoft edge

AdBlock with CatBlock is not a new ad-blocker but one that is been available for a while for Chromium-based browsers such as Google Chrome or Opera.

The Microsoft Edge version has been released as an alpha by the development team. The extension can only be installed on recent Windows Insider builds of Windows 10 (those with extensions support).

  1. Download the CatBlock extension for Microsoft Edge from the project's GitHub page.
  2. Extract the archive to the local system.
  3. Run the setup.cmd file that you find in the root folder.
  4. You may get a SmartScreen filter warning. Click on more info and then on run anyway.
  5. The screen flashes for a moment and the instructions.txt document is loaded in the end.
  6. Open Microsoft Edge after executing the setup file.
  7. Select the three dots (...) in the upper right corner of the Microsoft Edge interface, and then Extensions from the menu that opens.
  8. Click on the load extension button.
  9. Select the catblock folder (not the CatBlock Extension for Edge folder that you find setup.cmd in).
  10. You should see that Microsoft Edge lists the extension in the interface.

The extension works right after installation by replacing advertisement with images of cats automatically.

It is one of the first Microsoft Edge extensions that ships with several pages worth of preferences that you can dive in.

catblock edge

To do that click on the options icon next to its extensions listing in Microsoft Edge.

The first page lists the permissions that the extension has, an option to disable it and one to display its button next to the address bar in the Edge interface.

The options button on that page links to the full preference listing which enables you to modify core features. This includes disabling replacing ads with pictures of cats, adding custom filter lists using the same system that extensions like uBlock Origin or AdBlock Plus use, or replacing ads with other types of pictures.

catblock options
German settings, no idea how to change the language

Basically, you get features that are very similar to ad-blocking extensions and add-ons for other web browsers.

Closing Words

Catblock is provided as an alpha state extension for Microsoft Edge. The extension itself seems fairly stable already though but does not block Flash ads currently.

The first ad-block extension for Microsoft Edge is important for several reasons. It showcases that Edge's extensions engine is capable of supporting complex extensions, that Chrome extensions can be ported with relative ease to Edge, and that users can expect a wider range of extensions for Edge than for all versions of Internet Explorer combined.

The installation is currently everything but easy, but that is only an issue during the testing phase. You can see how Microsoft envisions the extension installation process by visiting the Windows Store page of the Pin It Button extension. (via Deskmodder)

CatBlock: first ad-blocker for Microsoft Edge
Article Name
CatBlock: first ad-blocker for Microsoft Edge
CatBlock is the name of the first ad-blocking extension for the Microsoft Edge web browser that has just been released as an alpha version.
Ghacks Technology News

Previous Post: «
Next Post: «


  1. silon said on May 28, 2016 at 12:56 pm

    Great tips. thanks

  2. AA said on May 6, 2016 at 5:15 pm

    “CatBlock’ hehehehehe… you can’t block what internet comprises of, i.e. cats :D

  3. Miron said on May 4, 2016 at 12:08 am

    Now i know how to block ads on your site. Thank you!

Leave a Reply

Check the box to consent to your data being stored in line with the guidelines set out in our privacy policy

We love comments and welcome thoughtful and civilized discussion. Rudeness and personal attacks will not be tolerated. Please stay on-topic.
Please note that your comment may not appear immediately after you post it.