

The 'MenuReadMe' explains how this works. You also have the ability to add a Menu entry from wherever your portable is located. Nothing extraneous now lives within the main directory.

This permits easier "dropping-in" of an existing profile from a previous version. The 'extralibs' directory - GTK3 & libdbus in this case - is again re-located to the top 'level', as is Thunderbird's 'profile'. These, like the current Firefox portables, are now built in my new, 'standard' portable format. I put these together several weeks ago, but have been testing the Qt5-powered 'BirdTray' app.which is the best replacement I've found for the now-defunct 'FireTray' extension. After publishing the new crop of Firefox portables earlier today, I thought I'd better release these corresponding new Thunderbird builds.
