So, first off, Firefox is my favorite browser. I love it a lot. I'm also a pretty big supporter of Free and Open-Source Software. With that said, I was wondering when and if Firefox will fully support ICC V4 profiles and the PNG specification. I noticed that ICC V4 is not enabled by default, but even after setting '''gfx.color_management.enablev4''' to '''true''' and setting '''gfx.color_management.mode''' to '''1''', ICC V4 is still not working properly. You can test this yourself here: https://littlecms.com/blog/2020/09/09/browser-check/ Also, I noticed that PNG images of large sizes won't display at all in Firefox, resulting in a broken image icon. You can test this yourself here: https://www.jwz.org/blog/2018/07/png-antics/ These seem to work at least passably well in other browsers, but I don't want to use other browsers! Does anyone know if Mozilla will fix these sometime? I do know that Little CMS is open-source under the permissive MIT license, so maybe Firefox could use that to fix the ICC V4 problem, if that could help. I don't know if using the latest version of libpng will help the other problem, but I know it is under a rather permissive BSD-style license. I'm using Firefox 90.0.2 in case anyone is wondering.