Hi,

You can try updating the McAfee add-on. The latest version is reported to be less problematic. Please also see this.

thx.but it's not solved yet.

Thanks for the feedback. You can also try to inform McAfee.

Firefox has a add-ons page to temporarily or permanently disable add-ons for checking: Tools (Alt + T) > Add-ons.

after i looked at the log of mcafee i saw that the slowly start of the firefox was caused due to the malwarebytes programme.i thank you for your efforts.

Thanks for the helpful information.