safari and firefox now crash immediately on launch in yosemite 10.10.1
Genieo Adware is installed.  Removing it will help.
  
  If you have another browser installed, use it.
     If not, launch App store and get another  browser for temporary use.
     Remove it afterwards.
  
  
  Use  free  AdwareMedic by clicking “Download ” from here
  
  http://www.adwaremedic.com/index.php
  
  Install , open,  and run it by clicking “Scan for Adware” button   to remove adware.
     Once done, quit AdwareMedic by clicking AdwareMedic in the menu bar and selecting
     “Quit AdwareMedic”.
  
  or
  
  Remove the adware  manually  by following the “HowTo” from Apple.
     http://support.apple.com/en-us/HT203987
  Safari > Preferences > Extensions
      Turn those off and relaunch Safari to test .
      Turn those on one by one and test.
  


Originally posted to the Apple discussion forum