We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

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

Error When Quiting Firefox

  • 3 ŋuɖoɖowo
  • 1 masɔmasɔ sia le esi
  • 1 view
  • Nuɖoɖo mlɔetɔ cor-el

more options

Every time I quit Firefox I get the following Error Notification:

[JavaScript Application]

ReferenceError: b is not defined

What is going on with this ???

Every time I quit Firefox I get the following Error Notification: [JavaScript Application] ReferenceError: b is not defined What is going on with this ???

All Replies (3)

more options

I suspect that an add-on is causing this error. Try the procedures in the troubleshooting extensions and themes article.

more options

OK problem solved. It seems the 2 problems I was having were related and both were fixed by uninstalling the "Fast Browser Search" extension. This was done by going to Tools->Add Ons->Extensions.

more options

You may also need to reset the pref keyword.URL and the user agent that have been changed by Fast Browser Search (FBSMTWB)

general.useragent.override:

Mozilla/5.0 (Macintosh; U; PPC Mac OS X 10.4; en-US; rv:1.9.2.10) Gecko/20100914 Firefox/3.6.10 FBSMTWB

keyword.URL:

http://www.fastbrowsersearch.com/results/results.aspx?s=NAUS&v=19&tid={E67318B9-71E7-FBB0-FC7E-7CF8756187B3}&q=

To open the about:config page, type about:config in the location (address) bar and press the "Enter" key, just like you type the url of a website to open a website.
If you see a warning then you can confirm that you want to access that page.

You reset a pref via the right-click context menu.
See http://kb.mozillazine.org/about%3Aconfig

cor-el trɔe