Hi Bob, do you have any sites to try the plugin with? I just installed it in Fedora 24 in FF53.0a1 and it installed successfully and appears to be enabled, but I'm not sure how/where to use it.

+

Umatrix is working as it should now in Firefox 50.0.2

I use it to reduce the clutter with sites such as: http://www.foxnews.com/

I have an icon I can click on for a menu permitting me to disable it if it blocks something I need to access.

Not having flash is a problem in printing crossword puzzles, always in demand here ...

-- 
Bob Goodwin - Zuni, Virginia, USA
http://www.qrz.com/db/W2BOD
box10  FEDORA-25/64it LINUX XFCE Fastmail POP3