Starting from version 3, Selenium is using Marionette - the new Firefox driver.
This note is about version 2.
Selenium has its own support pattern: http://www.seleniumhq.org/about/platforms.jsp
Firefox
Support for Firefox is the latest release, the previous release, the latest ESR release and the previous ESR release.For example Selenium 2.40.0 (released on Feb 19, 2014) supports Firefox 27, 26, 24, 17Selenium with Firefox can be run on any platform that Firefox supports for those versions, that also allow users to install a custom Firefox extension.
Find here version release histories:
Here, firefox downloads https://ftp.mozilla.org/pub/firefox/releases/
Installing Firefox v. 44.0 fixed troubles I had with:
MacOS 10.12.6
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]
gem:
cucumber (2.3.2)
selenium-webdriver (2.52.0)
MacOS 10.12.6
ruby 2.3.3p222 (2016-11-21 revision 56859) [x86_64-darwin16]
gem:
cucumber (2.3.2)
selenium-webdriver (2.52.0)
