I get this error message and Firefox does not start... EXC in ev handl: error: error definition property on NPObject!

Firefox does not start and this message keeps coming back... I uninstalled and reinstalled... but nothing helped...

EXC in ev handl: error: error definition property on NPObject!

Disable the extension "McAfee Site Advisor" who has just updated 3.4.0 that probably out of block of addons list.

  • 'Ctrl + Shift + A' > find McAfee Site Advisor and use 'Disable', and then restart Firefox.
  • Do a Google search without problem
  • It seems that if you re - enable new Site Advisor and restart Firefox you agree. At least you know where to look if you get the error again, or research on Google to slow down.

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