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Older FireFox can not validate PDF 1.9 Oct 10 update

ashawnn wrote on 2017-10-12:
Older Firefox can not validate PDF 1.9 Oct 10 update

I use several older versions of firefox ver. 40 - 48 and 52.

Update to PDF 1.9 Oct 10 2017 firefox ver 40 and 48 cannot validate new version while 52 does.

I find no link to rollback to previous versions. Is there a way to load a previous version?
support wrote on 2017-10-12:

It is not possible to load the previous version. We switched the addon to the new extension API that is not supported by older Firefox versions.