Here a small guide that I created that I hope will help others.
So the fix for the moment for me was to rollback to the last version before 55.0.x which is 52.0.2…armhf.deb
First! make a backup of your /home/(username)/.mozilla/firefox directory. This holds your profile, bookmarks, history, etc.
I assume you all know how to make a backup of a directory and even a hidden directory(from either the gui or cli) if not Google is your Friend
Now this is what I did to get back a working version of Firefox, (this is utilizing both gui and cli):
Launch Filezilla and go to ftp://ports.ubuntu.com (anonymous login), in the Remote site: window type in /ubuntu-ports/pool/main/f/firefox
if you don’t have Filezilla installed you can install it or use ftp from the CLI(terminal window).
Next scroll down and find firefox_52.0.2+build1-0ubuntu0.12.04.1_armhf.deb,(scroll to the bottom)
click and drag the file over your home directory(ex. /home/(username)/Downloads)
(If you use ftp from the command line I am assuming that you know how to make your way to the directory and file that I specified above and the commands to download the file.)
Open a terminal window and go to the directory that you use to download the file from above.
Now we have to remove the existing bad version of Firefox before we can install the package we downloaded…
sudo apt-get purge firefox
From the download directory where the firefox.xxxx.deb file is stored run the following command,
sudo dpkg -i firefox_52.0.2+build1-0ubuntu0.12.04.1_armhf.deb
After the dpkg was finished with the installation I launch Firefox from the command line.
firefox & while it was launching it complained about the language pack addons not being compatible… just ignore these messages, they are just warnings. Firefox should launch correctly
and open with the two default Ubuntu tabs. Close down Firefox and now
the icon for Firefox should have been installed on your Menu bar. Click on it to open Firefox again, but this time it should open with your profile so your bookmarks and preferences should still be okay. (For me
this was the case.)