The earlier version is lovely - the lack of obvious links in the main page is a problem, the links to working versions may be there and it's possible I haven't seen them but this is part of the definition of 'no OBVIOUS' links! No add-on developer should be collaborating in this desire to herd the sheeple into auto-update braindeath, "Automatically update" == "oh yes master developer I trust you to run anything you like on my system anytime you feel like it" Or, in my case NOT.
Your earlier version is lovely, you should be making it obviously available and telling people that Firefox 52 ESR is perfectly functional, with none of the RUSTbucket crippling the Chrome-Crazy development team want to inflict!
All the good add-ons work ok on Firefox 52, if you get 52.2.0 then you may need to alter about:config to force it not to complain about version numbers (do a websearch!) but otherwise it's equally lovely.