Firefox 54.0 has been released on June 13, 2017 to the stable channel. The new version is offered through the Firefox web browser's automatic update functionality,19.4MB and also provided as a direct download from Mozilla's website. All other Firefox channels, those are Beta, Nightly and ESR, are also updated. For more info go here. https://www.ghacks.net/2017/06/13/firefox-54-0-find-out-what-is-new/
Installed itself on Win 7 32 b it just now when I checked the present version.