The Ask Toolbar is causing that in the Firefox 3.6.13 version. Evidently something in that extension isn't compatible with a Firefox security fix. Disable that extension or un-install it.

I HAVE NOW DISABLED ALL TOOLBARS EXCEPT:

MENU BAR NAVIGATION TOOLBAR BOOKMARKS TOOLBAR

RESTARTED FIREFOX - TAB STILL DOES NOT WORK.

BEFORE THE TAB BAR STOPPED WORKING A MESSAGE SCREEN OPENED TO LET ME KNOW THAT CERTAIN SCRIPT WITH REFERENCE TO THE ASK TOOLBAR WAS WRONG? - CORRUPTED? - I COULD NOT COPY FROM THIS MESSAGE NOR SAVE IT.

WHAT TO DO???

I FOUND A SOLUTION FOR MY PROBLEM:

DISABLE ALL TOOLBARS. START IN SAFE MODE. SELECT OPTION FOR TOOLBARS SAVE AND EXIT RESART

NOW THE TAB WORKS!!!

REGARDS CHARLES

WITH REFERENCE TO PREVIOUS REPLY: - EVEN ASK TOOLBAR NOW WORKS!!

Thank you so much for your effective reply. My tabs are working now. Dear Sir/Madame , 1 more question please, why Mozilla crashes after a little load on it.Its also a major problem .Please suggest some effective way for this also.

Thanks again.

AFTER ALL SAID, I STILL HAVE THE SAME PROBLEM. I HAVE TO START USING FIREFOX SAFEMODE. AND HAVE TO DO SO EVEN WITH ASK TOOLBAR DISABLED ( TO GET TABS TO OPEN) THE BELOW MESSAGE COMES UP AND SHOULD BE INVESTIGATED TO HELP YOUR USERS. ESPECIALLY WITH THE REFERENCE TO "CHROME".

WHEN I START FIREFOX NORMALLY I CANNOT OPEN TABS WITH OF WITHOUT ASK. THUS I MUST USE SAFEMODE.

USING SAFEMODE AND EXITING - WHEN I STARTUP NORMALLY - NO NEW TABS - GOT TO GO THROUGH SAFEMODE, CLICK ON RESET OPTIONS, RESTART NORMALLY, THEN IT WORKS - BUT THE BELOW SCRIPT APPEARS.

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: chrome://asktoolbar/content/core.js:8