Building a UMatrix Replacement • Hacker News Board

Re: Building a UMatrix Replacement

#31

Post by SoMomentary » Tue, May 19, 2026, 1:11 PM UTC

madars wrote: post #17

SoMomentary wrote: post #15

Earlier quoted context omitted.

I thought these stopped working altogether with the release of Chrome 142? I know you could override it for awhile there, but I've been lead to believe that option is gone. This is part of what forced my hand and made Firefox my daily driver, at least for personal use.

It works fine in Chrome 148. Earlier Chrome versions removed chrome://flags versions of the above even with "Temporarily unexpire M147 flags" (and similar), but command line invocation continues to work.

Awesome, thank you so much for that! I'll have to dig in and get this working for my work machine where I still have to use Chrome. I literally quit using Chrome for personal use over this but I guess it was premature.

Re: Building a UMatrix Replacement

#32

Post by gitaarik » Fri, May 22, 2026, 4:57 AM UTC

dehrmann wrote: post #25

gitaarik wrote: post #19

Earlier quoted context omitted.

Indeed, this is why I eventually stopped using it; sometimes a random site wouldn't function properly, and took time to figure out it was uMatrix. It was a nice plugin indeed though.

uMatrix is very hard on sites by default. When something is glitchy, I assume it's because uMatrix blocked random third-party code.

Yeah true, but I had many sites that I manually white-listed scripts / external resources, and was succesfully using those sites. But then some particular functionality of the site you rarely use once stops working, and you later find out uMatrix was still messing with some stuff, even if you whitelist all resources.

Re: Building a UMatrix Replacement

#33

Post by Semaphor » Thu, May 28, 2026, 10:57 AM UTC

teddyh wrote: post #7

If you are running a modern Firefox, there’s still nuMatrix: https://codeberg.org/arek/nuMatrix >

I tried it, sadly it suffers from the same issues as uMatrix: Some things silently fail. I had hoped the fork was updated for modern browsers, but it doesn’t look like it.

An example is fastmail, the service worker gets blocked from some request for images, without any blocking showing up in uMatrix. Unblocking the domain in question makes everything work.