After discovering, downloading, and using portable Firefox for a few days, I've discovered an anomaly!!
Using the installed version, whenever I clicked a link external to Firefox (Windows 10 Mail, etc.), it opened in a new Firefox tab.
With the portable version, clicking the link now brings up a new instance of Firefox!
I've made sure all the Tab settings are checked and Firefox is my Default browser!
Any helo would be appreciated!
Windows 10 Pro
Firefox Portable 110.0