[Mod JTH: Test fix below: https://portableapps.com/comment/247766#comment-247766 ]
I updated to 92.0 today, using the Portable Apps application. When the Firefox Portable browser is running, if I click on the Howard E-mail Notifier from my system tray it is supposed to open up Yahoo! Mail in a new tab. But instead I get the "Firefox is already running" popup window which wants me to close Firefox Portable before it opens up a new instance with the Yahoo Mail tab. I re-registered Firefox Portable and I recreated the Pin to Taskbar shortcut. I also checked to see if AllowMultipleInstances was set to true, just in case. What is there left to try? This version of Firefox Portable is not behaving as it should. The only thing that I haven't tried yet is restarting my computer. I will try that later.