On Windows 10 with FF 75.0
After just now moving the entire Firefox Portable to a new location, customizations are missing from the toolbar and menu bar (I use a lot) and extensions don't appear in the Customize Firefox page. Extensions are listed correctly on the Add-ons page but they have no icons. I do have full access to my bookmarks and history.
Moving the program back to the original location restores everything but I don't want it there anymore.