Watch the reported issue.

As for now, you can install an extension like Stylus and create a style like this:

/*
==UserCSS==
@name             Lemmy Unblur
@match            https://lemmy.world/*
@match            https://lemmy.fmhy.ml/*
@version          1.0
==/UserCSS==
*/

.img-blur {
  filter: none !important;
}

I’m using it with FireMonkey on Firefox, but I believe it should work with Stylus too.

For those using other Lemmy instances, you need to edit or duplicate the @match line with the URL of the one you’re using.