this post was submitted on 20 May 2026
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I used to have uMatrix runing on my browser. It basically works like a firewall, preventing cookies, scripts and other stuff running on your browser without your consent.

It gives you much more control than uBlock, but it is also known for breaking websites if you don't set what you allow the browser to run properly. I remember it being quite tedious, as I had to go through the process of setting those things properly on each new website I was visiting.

Maybe some of you use it already, and would like to share the experience. Maybe others didn't know about it and would like to give it a try. Either way, I don't hear that many peopl talking about this tool, so I thought of sharing it here.

Have a wonderful day!

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[–] MonkderVierte@lemmy.zip 2 points 10 hours ago* (last edited 4 hours ago)

I've read something about Javascript compatibility issues years ago, which lead me to switch to uBlock Origin 100%. Search engines suck for such things, so i've asked Haiku via duck.ai:


UI & Interface Issues

Mozilla Discourse Support Thread (2017-2018): https://discourse.mozilla.org/t/support-umatrix/5131?page=5 Mozilla

Documented issues include:

  • Column truncation: The "OTHER" column gets cut off when scroll lists appear in Firefox
  • Settings button broken: The gear icon for accessing settings is non-functional on Firefox 56+
  • Popup window sizing: The popup window is too narrow, cutting off the right half of the interface
  • Cloud storage export: Export functionality breaks on Firefox nightly builds

JavaScript Blocking Issues

GitHub Issue #902 (January 2018): https://github.com/gorhill/uMatrix/issues/902 GitHub

Reports of JavaScript blocking not functioning properly on Firefox 56/57, with the logger showing blocks that don't actually prevent script execution.


There's also nuMatrix, but that seems buggy, with outdated default lists, disappearing new lists.

Edit: formatting