Post 2.0.0 goal: Unzip-and-Go Portables

There is non-zero demand for I2P portable installs, which i2p.firefox is uniquely suited to deliver as a jpackage-based distribution with a built-in browser profile manager. As it stands right now, the NSIS Installer simply unpacks a portable I2P install into the default install directory, the directory itself is entirely relocatable(to a flash drive, for instance). Just packaging with zip instead of nsis is enough to get a basic portable install now. But for a portable where the host browser doesn't have to come into play which I'm calling an "Unzip-and-Go" portable we need to bring a browser and since I'm not getting sucked back into building and delivering a browser, I need to find one that has the time and interest to work with me and come up with some requirements for it. Librewolf seems like a very likely option with some caveats. Others could be: regular Firefox, IceCat, Tor Browser, Waterfox.

Requirements

1. It should be possible to update the browser in place, automatically, without updating the I2P router
2. The update should ask the user before continuing
3. It should be possible to discover updates in-network, without the use of an outproxy
4. The browser should update at nearly the same pace as any upstreams they use
5. To be determined/refined