" some folks are using 18.104.22.168, but I do not know where they are getting it "
Might have been posted, then taken down?
Firefox add-ons site now showing 4.4.1 as last stable but the latest version showed has been changing in recent weeks.
Teester is right that latest BETA version shown now is 22.214.171.124a ) Released Oct. 25, 2017 https://addons.mozilla.org/en-US/firefo ... sions/beta
I found download site, MajorGeeks, has copy of 126.96.36.199
Go to http://www.majorgeeks.com/files/details ... refox.html
but cancel or click No on default install (or use script blocking, or a non-Firefox browser, to block default automatic installation. )
The link, Download at Author's site will download current beta 188.8.131.52a.
But if you click on one of the two Download at MajorGeeks site links, these link to a 184.108.40.206 download.
(To save a copy locally for yourself, in case you want to later un-install and then later re-install 220.127.116.11, First left-click on one of the two Download at MajorGeeks links, and the next page, RIGHT click on the banner rectangle "Click here if it does not", then menu Save Link as and save local copy of .xpi file )