Modified your modification to also improve the size of embeds (ie redgif content)

// ==UserScript==
// @name lemmynsfw no blur and embed size tweak
// @version 1.2
// @description unblur
// @match https://lemmynsfw.com/*
// @grant GM_addStyle
// @run-at document-start
// ==/UserScript==

GM_addStyle(`
  .img-blur {
    filter: none !important;
    -webkit-filter: none !important;
    -moz-filter: none !important;
    -o-filter: none !important;
    -ms-filter: none !important;
  }
  div.post-listing > iframe {
    width: 100%;
    height: 26rem;
  }
`);