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I play Mafia Wars and I get the following message going to Mafia Wars from Facebook: "You need Javascript enabled in your browser to use Facebook Applications."

  • 16 replies
  • 1 has this problem
  • Last reply by jscher2000

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I have Javascript enabled but it continually gives me this message. I followed the Safe Mode instructions and brought up FB and tried clicking on the Mafia Wars game link and still get the same message "You need Javascript enabled in your browser to use Facebook Applications." When I am on my home page of and someone posts a link to, when I click on that link, it doesn't take me to that page, but gives me that message. It doesn't do it when I use Google Chrome.

All Replies (16)

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I assume you've checked your settings here, right? Firefox JavaScript Settings

Next, make sure your plugins are all up to date. Plugin Check

Moving on, make sure that the plugin called Java(TM) Platform SE 7 U5 is Enabled. To do this, go to Tools -> Add-ons -> Plugins and make sure this is Enabled.

Hopefully this helps.

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Thanks for the reply. All of the above check out and I still get the message. There are times when I click a link that I am able to open the page, but most of the time, I get the message.

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No problem I try to help if I can ^.^

According to cor-el's solution: Possible solution

1. Clear the cache

2. Remove cookies

3. Close and restart Firefox

Does that help?

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I did that and still no good. I keep getting the same message.

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

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I went through the whole process up to resetting Firefox and the problem still exists. The next step has me resetting Firefox. I'm not sure about that, since it will remove all my extensions and I want them back without a problem. Any thoughts on this process?

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You're right, resetting will remove all your extensions. It'll just be a hassle to re-install them.

Before you do that, try this:

  1. Type "about:config" in the awesome (URL) bar. Accept the warning.
  2. Type "java" in the search box.
  3. Make sure every Preference is set as default

Could it be something wrong there?

Modified by FireChemist

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Do you have security software (firewall) that can block JavaScript?

Did you check that?

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I do appreciate you two helping me out.

First I disabled my Norton 360 and still got the message. Then I typed about:config on awesome url and found one that was not set to default. Here it is:

Preference Name= pref.advanced.javascript.disable_button.advanced; Status= user set Type= boolean Value= true.

I don't know how to change it to default. I tried to double click on it and all that changed was the value from true to false. Next step?

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Hm, that's strange. I have

  • "services.sync.prefs.sync.pref.advanced.javascript.disable_button.advanced status=default type= boolean value=true"

instead as the closest match to that preference you indicated. It should start with the words "services.sync.prefs.sync." not sure what happened there. I would recreate the original "services.sync.prefs.sync.pref.advanced.javascript.disable_button.advanced" by going back to about:config

  1. Right-click
  2. New -> Boolean
  3. Enter "services.sync.prefs.sync.pref.advanced.javascript.disable_button.advanced"
  4. Set as true
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The line you asked me to recreate is there as well and has the following: status=default type= boolean value=true.

When I searched Java, the only line that was bold and was not set to default was the line as I mentioned above:

pref.advanced.javascript.disable_button.advanced; Status= user set Type= boolean Value= true.

Do you think that line could be the problem? Any suggestions?

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I can't say for sure. Here's what I recommend. Try toggling the state of that preference and see if it helps.

If it helps, great! If it doesn't help, I'm not sure what else to say...

But what I do know is that since toggling that preference doesn't show the Default status again, that means it's not a default firefox preference. Either yourself or an add-on created it. That means if you're ever going to reset Firefox and lose all your extensions and custom preferences, you might as well do this to remove that preference first to see if it will help.

  1. Right-click on that preference
  2. Select "Reset"
  3. Restart Firefox and that preference should disappear
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The services.sync.prefs.sync.pref prefs are only used to specify which prefs to include in that data that is saved on the sync server when you are using sync. It doesn't have any other purpose.

Anyway prefs like pref.advanced.javascript.disable_button.advanced are meant to disable specific buttons in options by locking them via a mozilla.cfg file to a the true value. In this case the button to modify the advanced JavaScript settings.

If this error is really about JavaScript being blocked then either a Firefox extension is blocking the JavaScript or your security software is blocking JavaScript.

To avoid confusion:

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I tried Toggling it and it didn't work. I reset the preference to default and it didn't work. I guess I need to right down the extensions I have, reset Firefox and lose all extensions, restart Firefox and see if the problem continues. If it occurs, then there is another area that is the cause. If it doesn't then I will add each of my extensions, one by one, restarting each time to see if the problem occurs. That way if it does, I will know which extension is causing the problem.

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Cor-el, by me disabling my security software and the problem continues, then that should mean that my security software isn't what is causing the problem. So based on that, do you suggest I reset Firefox, removing all extensions and adding them one by one as I outlined above?

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