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
Windows Mail
Firefox Portable 110.0