I have a closed Ubuntu installation I use to clone and quickly setup a VM. The closed system uses a proxy with restricted access to the internet, as such I would like to give it systemwide settings that will effect new and existing users. I have attempted to use /etc/firefox/syspref.js, and apturl.js in /etc/firefox/pref/apturl.js. I have setting in EnvVars for HTTPS_PROXY and HTTP_PROXY pointing at the proxy http://proxy:8080. It seems by default firefox does not look at that. Secondly I wanted to turn off the site warnings for intranet sites using the following options: pref("security.insecure_field_warning.contextual.enabled,false") pref("security.certerrors.permanentOverride,false") pref("network.stricttransportsecurity.preloadlist,false") pref("security.enterprise_roots.enabled,true") Seeing as nothing I try seems to be working, and the potentials solutions were for older versions, is there a way I can do this? Thanks JJ