Round two. Firefox 51 was slow to load until yesterday, when it stopped loading altogether. As in never even gets tot he splash screen. this morning remove ff51, and install 53. Launch from desktop icon with command line: "C:\Program Files\Mozilla Firefox\firefox.exe" -p Depart for meeting. Three hours and 42 minutes later, it has popped up the window "Which profile do you wish" - only it is a) no responding" (says so right int he title bar) and b) grey, faded, incomplete and did I mention "not responding"? Kill process, remove the -p option, start again. Eventually it hangs because a script is not exiting. Again with the faded, greyed out pop-up window, which shows nothing other than the title at the top of the window. WIndows 7, FF53 Is there some way to start Firefox in "minimalist" mode - no add-on,s extensions, options, themes, excessive resource demands, so that I can just get it running?