Hello, in a web site login form, that has been working on firefox and stills does work in Explorer and Chrome. After updating to Firefox 56 , the form does not work anymore. It is on a HTTP site, the form submit is done by javascript by submitting the form from it. Inspecting the network request, the web form (created by JS) sits at: "http://ip_address/" The action value of the form has a value like: "http://ip_address/login/indice/test" But submitting the form shows in the developer mode that the values sent (correct parameter names and correct values) , get send to "http://ip_address/" instead of "http://ip_address/login/indice/test" If i log directly to "http://ip_address/login/indice/test" in Firefox and get the login page, and try to log in from there (having shown in the URL of the browser the ending "/login/indice/test"), the login does work. This is not necessary in any other browser and in firefox 55 and below, when accessing to "http://ip_address/", and submitting the form, values get submitted to "http://ip_address/login/indice/test" and log in or have error message correctly shown. So not sure if it is a problem with of javascript, or a problem following a redirect command from the server, or having the form submit to a different method from JS, any help is appreciated