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

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

eval in Sandbox pop up

more options

Immediately after upgrading to Firefox 33.0, I immediately began having these issues:

After navigating to a webpage (not all pages, but seemingly random pages, about 35-40 percent of the time:

Popup Box titled: (javaScript application)

evalInSandbox:TypeError: 'alert' called on an object that does not implement interface Window.

After hitting “OK, the following box comes up: (Also titled JavaScrpit Application)

Error: 'alert' called on an object that does not implement interface Window.

I am running a Windows 7, 64 bit, and have attempted to update java, and also have deleted several old updates, and still get the same pop-ups. I can find no help on the Google machine. PLEASE HELP!!!

Thanks in advance.

Immediately after upgrading to Firefox 33.0, I immediately began having these issues: After navigating to a webpage (not all pages, but seemingly random pages, about 35-40 percent of the time: Popup Box titled: (javaScript application) evalInSandbox:TypeError: 'alert' called on an object that does not implement interface Window. After hitting “OK, the following box comes up: (Also titled JavaScrpit Application) Error: 'alert' called on an object that does not implement interface Window. I am running a Windows 7, 64 bit, and have attempted to update java, and also have deleted several old updates, and still get the same pop-ups. I can find no help on the Google machine. PLEASE HELP!!! Thanks in advance.

Gekose oplossing

<SOLVED> Disabled all add ons and then enabled them one by one...There were two add-ons causing the error. Thank you.

Lees dié antwoord in konteks 👍 0

All Replies (3)

more options

hello, can you try to replicate this behaviour when you launch firefox in safe mode once? if not, maybe an addon is interfering here...

Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems

more options

Launching Firefox in Safe mode fixes the issue....so I am assuming I have to re-enable each add-on individually to find out which one is causing the problem??

more options

Gekose oplossing

<SOLVED> Disabled all add ons and then enabled them one by one...There were two add-ons causing the error. Thank you.