[Help-librejs] LibreJS as a userscript?

[Harry Prevor]

I use a fully free software GNU distribution and I've been very
interested in LibreJS. Unfortunately though, I use uzbl rather than
GNU Icecat/Iceweasel for other reasons and I thus can't install .xpi
Mozilla addons. I can, however, install userscripts, as most internet
browsers can.

I don't know a lot about how userscripts work and the extent of what
they can do; can a userscript emulate the core functionality of
LibreJS? Have there been any attempts to make a LibreJS userscript
yet? If not, can someone give some pointers to how one could be
developed?

-- 
Harry Prevor