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

When using gmail (and maybe at other times too) I get repeated pop-ups stating [JavaScript Application] Exc in ev handl: TypeError: oSAPlg.oRoot.log is not a function. How can I stop this?

more options

In addition to the above-mentioned pop-up message, sometimes I get the following:

[JavaScript Application] Exc in ev handl: Error: Bad NPObject as private data!

These pop-ups prevent me from doing anything on the computer until I close the pop-up window, which is sometimes quite difficult.

In addition to the above-mentioned pop-up message, sometimes I get the following: [JavaScript Application] Exc in ev handl: Error: Bad NPObject as private data! These pop-ups prevent me from doing anything on the computer until I close the pop-up window, which is sometimes quite difficult.

Chosen solution

Are you using the McAfee Site Advisor? It has been causing that message to appear. Disable it in the Add-on Manager tab > Extensions until McAfee can fix it.

Read this answer in context 👍 9

All Replies (5)

more options

Chosen Solution

Are you using the McAfee Site Advisor? It has been causing that message to appear. Disable it in the Add-on Manager tab > Extensions until McAfee can fix it.

more options

I have done as you suggested. I'll see if it helps and revert. Many thanks.

more options

Tried to check to see if McAfee Site Advisor is enabled... but now the Add-on Manager won't load... opens a new tab, but then just spins. What's going on?

more options

I'm not computer-literate enough to answer your question, but I can confirm that the solution that was recommended to me has indeed worked, and I have had no problem with these pop-ups for the last week. - Chris.

more options

@bboyd2

Click on the Extensions item on the left-side when the Addons Manager opens.