It seems i am not able to make permanent changes to Firefox in the Safe Mode window for a better study & shift + starting firefox is not always reliable … I was following this guide http://www.sevenforums.com/tutorials/210670-firefox-start-firefox-safe-mode.html but after step 3 the diagonal box where you can select the opions never opens firefox starts without it. & so i can not select user profile. Please if there is any other way to do this.