I am not seeing any Sidebars.. Does it appear after Logging-in ??

Yeah, once logged in the sidebar is on the left.

Troubleshooting extensions and themes

• https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes

Clear Cookies & Cache

• https://support.mozilla.com/en-US/kb/Template:clearCookiesCache

Websites look wrong

• https://support.mozilla.com/en-US/kb/Websites%20look%20wrong
• http://kb.mozillazine.org/Websites_look_wrong

Check and tell if its working.

Thanks, however none of those have solved the issue.

1. It still happens in Safe Mode. 2. I have cleared everything many times in both modes but it doesn't help. 3. Settings were all as recommended.

Basic Troubleshooting

• https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting

Check and tell if its working.

I have now tested this on three computers with FF6. One was a fresh install, one an upgraded version with no add-ons and one my computer with all it's add-ons. None of them display the sidebar correctly even in Safe Mode, leading me to believe it is a problem with the latest FF release.

-> Create a New Profile as a test to check if your current profile is causing the problems.

Managing Profiles

• https://support.mozilla.com/en-US/kb/Managing-profiles
• Once you've created a new profile, select it in the Profile Manager and click Start Firefox.

-> If that New Profile works then you can recover your Bookmarks and Passwords from the Old Profile. See this:

Recovering important data from an old profile

• https://support.mozilla.com/en-US/kb/Recovering%20important%20data%20from%20an%20old%20profile

Check and tell if its working.

Before I go down that route I should say that the side bar uses Javascript. Are there known Javascript issues in FF6?

JavaScript

• https://support.mozilla.com/en-US/kb/JavaScript

Allowing only certain sites to use JavaScript

• http://kb.mozillazine.org/Allowing_only_certain_sites_to_use_JavaScript

Check and tell if its working.

I created a new profile. It didn't help.

Is the concerned site appearing normally in other Web Browsers (IE, Chrome, Safari, etc.) ??

Works in IE just fine.

Have you ever used that website with an older version of Firefox?
Maybe that problem is related to Firefox 6.0 beta??
Or maybe it started not working correctly in Firefox 5.0 or 4.0??

You can install a Firefox Portable version to see how it worked in older versions, without affecting your current version of Firefox.
http://portableapps.com/apps/internet/firefox_portable
http://portableapps.com/apps/internet/firefox_portable/localization#legacy
Scroll down a bit for Firefox 3.6.x.

Sorry, without login credentials we won't be able to see the problem first hand.

Yeah, it worked fine in FF4. I never used FF5.

I'd like this to be fixed in FF6, which is why I raised it. For now I will use IE for this site. Not ideal but until there is a fix that is what I will do.

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click on "Solved It" Next to the reply ABOVE that BEST solved your question

DO NOT click "Solved It" next to this reply

Maybe the problem is from Website Developer's end.. They might need to upgrade their code to become fully-functional and compatible with future Firefox releases..

Just to spare you asking, i can confirm:

- it worked in ALL previous versions of Firefox (including 5.0) - it worked in ALL versions of Internet Explorer - it worked in ALL versions of Opera - it worked in ALL versions of Chrome - it worked in ALL versions of Safari

18 people have clicked "I have this problem too" so far.

I suggest that you don't look for easy, third-party solutions. There is little doubt now. This problem is FF6-specific.

Downgrading to 5.0

I'm off autoupdates as well now,

Select Firefox->Options->Options->Advanced->Updates if you don't won't FF6 to install automatically.

Seems a good idea anyway as apparently beta versions make it much too quickly to final releases these days.

P.S. The problem persists in FF7.

This is really Firefox 6 problem! I dont like how Mozilla release browser updates nowdays.. if this is quality. Lets go old fashion.

Internet Explorer is the last thing i will use..