I've been a Firefox user since the beginning, but every few years I leave the browser because it becomes unusable. I am at one of those inflection points now. During the past few weeks, I've run into web pages that simply will not work in Firefox. I have not tracked all of the URLs, but can tell you they include navigation of Tax1099 (a website used to send tax documents) and AT&T, where I could not access their Premier shopping page. These pages load easily in Chrome and Edge. Yes, I've tried standard troubleshooting, including disabling my longstanding extensions and all suggestions in this article (http://mzl.la/1xKrMnN). I simply do not have time to troubleshoot this every day, every time I need something in timely fashion. It is a huge time suck. Firefox has -- again -- become an impediment to my work flow and it seems time to leave it, again. I;m not asking for help; this is simply a fact. And Mozilla should consider it a reason why Firefox has lost popularity. Most people will simply move on, and not do any troubleshooting, take the time to search for solution or write to this board. In the past, I've been told that this is MY problem with MY systems (because this happens on two different computers). Whether or not that's true, it doesn't change the fact that other browsers do not have this problem. Ever, in my experience.