Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

The following keeps popping up before firefox will load, Exc in ev handl: TypeError: this.oRoot.enable is not a function

  • 4 பதிலளிப்புகள்
  • 32 இந்த பிரச்னைகள் உள்ளது
  • 5 views
  • Last reply by David McRitchie

There is a pop up box, it says,"Exc in ev handl: TypeError: this.oRoot.enable is not a function" It pops up before Firefox will load, what is it?

There is a pop up box, it says,"Exc in ev handl: TypeError: this.oRoot.enable is not a function" It pops up before Firefox will load, what is it?

All Replies (4)

Hi, I have that version, but did a fresh download anyway, still getting the pop-up, thanks though!

Troubleshooting extensions and themes

Check and tell if its working.

Disable "McAfee Site Advisor" extension which was just updated to 3.4.0, which probably took it out of the addons block list.

  • "Ctrl+Shift+A" > find McAfee Site Advisor and use "Disable", and then restart Firefox.
  • Do a Google Search no problem
  • It seems that if you re-enable Site Advisor again, and restart Firefox you are okay. At least you know where to look if you get the error again or Google searches slow down.