Could you try disabling graphics hardware acceleration? Since this feature was added to Firefox, it has gradually improved, but there still are a few glitches.

You might need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.). Then perform these steps:

• Click the orange Firefox button at the top left, then select the "Options" button, or, if there is no Firefox button at the top, go to Tools > Options.
• In the Firefox options window click the Advanced tab, then select "General".
• In the settings list, you should find the Use hardware acceleration when available checkbox. Uncheck this checkbox.
• Now, restart Firefox and see if the problems persist.

Additionally, please check for updates for your graphics driver by following the steps mentioned in the following Knowledge base articles:

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

Upgrade your graphics drivers to use hardware acceleration and WebGL

Did this fix your problems? Please report back to us!

Still didnt work

Other people also are test the menu and the result are same.

Try the Firefox Safe Mode to see how it works there. The Safe Mode is a troubleshooting mode, which disables most add-ons.

(If you're not using it, switch to the Default theme.)

• You can open the Firefox 4.0+ Safe Mode by holding the Shift key when you use the Firefox desktop or Start menu shortcut.
• Or use the Help menu item and click on the Restart with Add-ons Disabled... menu item while Firefox is running.

Don't select anything right now, just use "'Start in Safe Mode" To exit the Firefox Safe Mode, just close Firefox and wait a few seconds before using the Firefox shortcut (without the Shift key) to open it again. If it is good in the Firefox Safe Mode, your problem is probably caused by an extension, and you need to figure out which one.

Please follow the Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems article for that.

When you figure out what's causing your issues, please let us know. It might help other users who have the same problem.

In safe mode stil didnt work.

Now i see that not only dropdown menu didnt work. The slideshow also have bug.

The site appears to be using an older 1.2.5 version of MooTools that is not compatible with current Firefox releases.

• http://www.mozilla.org/en-US/firefox/18.0/releasenotes/

Quote: Mootools 1.2.x incompatible with Firefox 18 and newer.Fixed in Mootools 1.3 and newer (see 789036)

• bug 789036 - MooTools 1.2.x was broken by adding String.prototype.contains

Yes! This is the right answer.

I downloaded the latest version of Mootools and then overwriting.

There is little difference in the design of menu, but the important thing is that it works

Тhank you!

I have similar problem. As soon as I downloaded the latest Firefox the drop down menus stopped working on a site I access and need every working day. I tried to download Mootools but got error message and couldn't download.

I am not an expert user.

I have had to use IE as now Firefox is unusable for me. I tried going back to previous version but didn't understand the website as it was just a list of files but no explanation as to how to download.

Can anyone give me simple instructions on how to revert or fix the problem?

Ok so I found a way to go back to the earlier version, but I got the same problem again - this means I can't use firefox - as the drop down boxes are essential for me.

A good place to ask advice about web development is at the MozillaZine "Web Development/Standards Evangelism" forum.

• http://forums.mozillazine.org/viewforum.php?f=25

The helpers at that forum are more knowledgeable about web development issues.
You need to register at the MozillaZine forum site in order to post at that forum.

Thank you. I'll give that a try.