Reenabling Firefox Plugins in NixOS unstable

There was just a change in nixos-unstable which disabled all the user installed plugins in firefox. I tried reading the code and there did not seem to be a simple way to go back to user installed plugins.

I can’t seem do figure out how to go back to the previous behavior.

Why is there not a simple:

firefox.enableUserExtensions = true;

Or some such?

also been bitten by this and opened apparently a fix is being reviewed.

I switched to using firefox-bin, which doesn’t have the issue [Yet?]