Twice Restart and Twice NOT working Rated 1 out of 5 stars

So disappointed in Firefox for removing my ability to use my Garmin Communicator. The end user should get to decide what he/she wants to use....I thought this would solve that problem unfortunately it was false hope. I installed and restart as indicated and it didn't work, asked me to do it again, so a second time I repeated the DL and Restart only for a second failure... can someone fix this???!