Firefox version 81 works with Extended Kernel. Not sure of any major issues since I only went to Google, but videos would probably be a problem since I believe versions beyond the 60's have issues with some videos. If you want to test this out, but aren't sure of how to do it, go to this thread for a tutorial. Credit goes to WinClient5270 and TatsuyaSou for the tutorials. I just took them and compiled it into one, hopefully easy to follow tutorial so you don't have to hunt between a YouTube Video and a thread.