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Have a Javascript:viod(nul) problem that I cannot fix

  • 5 replies
  • 5 have this problem
  • Last reply by jscher2000

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Tried to follow in Firefox tool>options then click on "enable Javascript" check box but this check box wasn't there - how do I enable this?

All Replies (5)

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Hi Robert, JavaScript is enabled by default. If it were not enabled, half the sites on the web would be blaring out messages to you about it, so most likely you have it enabled. If you want to double-check:

(1) In a new tab, type or paste about:config in the address bar and press Enter/Return. Click the button promising to be careful.

(2) In the search box above the list, type or paste javas and pause while the list is filtered

(3) If the javascript.enabled preference is bolded and "user set" to false, double-click it to restore the default value of true

If that is already set to true, could you provide more information about the circumstances of the problem?

Generally speaking, when a website uses


or similar as the destination of a link, there is nearly always a script connected to the link that runs when you left-click it. Note that trying to direct that link to a new window or tab often fails because when you do that, the script may not run at all, so you just get the useless placeholder address in the address bar.

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Many thanks for the response and this is on an airline site and I am trying to book selected flights. Maybe it is just this specific website that has an error in right now and it also give a unresponsive script message. Are these two tied?

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An unresponsive script warning can have many causes.

What kind of address does the dialog list? For example:

  • addresses starting with the name of the site usually are features/functions of the page
  • addresses from other sites often (but not always) are advertising networks - using an ad blocking extension can help address issues with slow or dysfunctional ad network scripts
  • addresses starting with chrome:// usually are part of Firefox or of an extension you installed - the Skype extension sometimes causes this problem, for example

We have a general support article addressing potential solutions to this issue: Warning Unresponsive script - What it means and how to fix it.

Another common cause of unresponsive script errors on Windows 7 is the protected mode feature of the Flash player plugin. That feature has security benefits, but seems to have serious compatibility issues on some systems. You can disable it using the Add-ons page. Either:

  • Ctrl+Shift+a
  • "3-bar" menu button (or Tools menu) > Add-ons

In the left column, click Plugins. On the right side, find "Shockwave Flash" and click the More link. Then uncheck the box for "Enable Adobe Flash protected mode" and try that for a day to see whether it helps.

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Again thanks and this is the message "A script on this page may be busy, or it may have stopped responding. You can stop the script now, open the script in the debugger, or let the script continue.


Then I simple press stop and when I hit the continue nothing happens and a corner pop up states "javascript:void(null).


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The corner popup may be the address of the link/button below the mouse pointer; that's the most common source of those little status messages.

Since the issue is with a script in the website, it's possible that something the script requires of Firefox is disabled or blocked. That's hard to know without a developer putting hands on the page. Next best thing would be to try the general suggestions in my earlier post.