I used to love this addon but no longer. It does not matter which browser or version is used. It doesn't work. The only version that worked was 56.1 but it's gone, why ??? It doesn't save any settings at all. And why are you NEVER responding to meil or even here ??

PEOPLE! TRY THIS! IT REALLY WORKS!
From User 7d96d8

For Firefox 56 users

Download No Squint Plus version 50.0 from here

https://addons.mozilla.org/en-US/firefox/addon/nosquint-plus/versions/

You have to choose 'Download anyway'

This will download an xpi file (nosquint_plus-50.0-fx.xpi).

Save it anywhere you want on your PC (easiest is just the desktop)

Now drag and drop this xpi file onto your Firefox shortcut on your PC desktop (even if you have Firefox running).

You will now be prompted to install the Add On

And there you go. A working No Squint Plus for Firefox 56

PS; Set updates to 'Off'

THANK YOU User "7d96d8"

I HAVE ANOTHER SOLUTION!! Install FEBE here! This backs up all your data including all settings in your addons !!
http://softwarebychuck.com/febe/febe.html