New Firefox 53.0.3

A New Firefox 53.0.3 will be released later today 19 May 2017 to get when released  click on help>about Firefox>check for updates   Release notes

fixed

• Fix hangs when using a proxy with NTLM authentication (bug 1360574)

• Fix excessive resource usage from the captive portal detection service (bug 1359697)

https://www.mozilla.org/en-US/firefox/53.0.3/releasenotes/