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Starting Firefox, this message appears (I have a screen shot available) Java Script Application Exc in ev handl: TypeError: this.o.root.enable is not a function

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Starting Firefox, this message appears (I have a screen shot available) Java Script Application Exc in ev handl: TypeError: this.o.root.enable is not a function

26 Sept. 2011 I get the dialog box mentioned in the Question when I click to open Firefox. I click OK button in dialog box and Firefox opens/launches. I installed Java around the same time I installed Firefox. I installed Firefox and Java within the last seven days. I have a screen shot of the dialog box.

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Site Moderator

Re: Starting Firefox, this message appears (I have a screen shot available) Java Script Application Exc in ev handl: TypeError: this.o.root.enable is not a function

This issue can be caused by the McAfee Site Advisor extension


Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

3 REPLIES
Site Moderator

Re: Starting Firefox, this message appears (I have a screen shot available) Java Script Application Exc in ev handl: TypeError: this.o.root.enable is not a function

This issue can be caused by the McAfee Site Advisor extension


Start Firefox in Troubleshoot Firefox issues using Safe Mode to check if one of the extensions is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).

New User

Re: Starting Firefox, this message appears (I have a screen shot available) Java Script Application Exc in ev handl: TypeError: this.o.root.enable is not a function

Firstly I disabled McAfee SiteAdvisor extension found in Extensions in the Add-ons tab. This was a solution to the issue. Problem solved!

Next, I disabled the McAfee ScriptScan for Firefox 14.4.0 as well. Just for the heck of it.

Thank you for the help!

Site Moderator

Re: Starting Firefox, this message appears (I have a screen shot available) Java Script Application Exc in ev handl: TypeError: this.o.root.enable is not a function

You're welcome