Howdy, After I take time to create the following custom files: prefs.js userChrome.css userContent.css How can I embed them into FF Setup so during install we can have FF installed with those custom settings? I can extract FF Setup 57.0.4 using WinRAR to have the installation source files. Can I inject prefs.js userChrome.css userContent.css into setup? Also, is there a way to instal FF without Maintenance Service by default? Thanks, Omid.