Disappearing Customized Toolbars in Firefox 4 Portable Edition

Hello:

I'm trying to get a feel of Firefox 4 before actually installing it by using the Mozilla Firefox Portable Edition from PortableApps via a removable USB flashtick drive.

I still have Firefox 3.6.16 installed on my hard drive, and I never use the two versions concurrently.

A major problem I'm having with Firefox 4.0 is the all-too-frequent disappearance of customized toolbars. I have two such toolbars configured. One on top, with Firefox functions such as bookmarks, history , web-clipper, etc... I've also populated the Add-on Bar on the bottom with similar icons such as clear cache, no script,etc...

Approximately once daily, I lose all my toolbars. Seems to happen when I'm rearranging the icons on the toolbars to get a more optimal interface. I fix the situation by restarting in Safe Mode with all add-ons disabled. I need to reset it to "Reset Toolbars and Controls". I then get my Bookmarks Toolbar back with all the previous links and their icons, but the Customized Toolbar I've created directly below the Navigation Bar needs to be recreated from start. Also , the icons I've placed in the Add-on bar below need to be restored.

What might be causing these frequent disappearances of the toolbars? This does not happen with Firefox 3.6 which is currently installed to my hard drive.

Might this be my use of the Portable edition of Firefox 4?
Or is it more likely some add-on I'm using?

This rarely happens in Firefox 3.6, and almost all of the add-ons I use in Firefox 4 are also used with Firefox 3.6.

How would you suggest I approach troubleshooting this?

I post a list of add-ons now used with Firefox 4.0

Thanks in advance:

Eliuri

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Firefox 3.6.16

Firefox 4.0 Port Edition from PortApps via Flash Stick
Windows XP Pro SP3

(I had originally posted this inquiry at the Mozillazine Forum ,but the moderator there suggested I post it here instead)
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Here's the list of add-ons I now use in the Portable Edition of Firefox 4:

- Firefox 3 Theme For Firefox 4:

- Clear Cache Button 0.9d
Firefox 2.0 - 4.0.*

- Easy Youtube Video Downloader 4.0
Firefox 2.0 - 4.0.*

- Evernote Web Clipper 4.0.0.131046
Firefox 3.0 - 4.0.*

- Extension List Dumper 1.15.0
Firefox 1.5 - 4.0.*

- Firefox 4 UI Fixer 1.4.2
(Disabled)
Firefox 4.0b7 - 4.2a1pre

- GMarks 1.0.2.2
Firefox 3.0 - 4.0.*

- Google Toolbar for Firefox 7.1.20101113Wb1
Firefox 2.0 - 4.*

- Hebrew Calendar 1.0.5.06
Firefox 1.0 - 4.0.*

- Java Quick Starter 1.0
Firefox 1.5 - *

- NoScript 2.1.0.1
Firefox 3.0 - 4.2a1pre

- NoSquint 2.1
Firefox 3.0 - 4.0.*

- Open GMail with toolbar button 1.0
Firefox 3.5 - 4.0.*

- SearchPreview 5.0.1
Firefox 1.5 - 4.0.*

- Sifrei Kodesh Search 0.4.1
Firefox 1.5 - 4.0.*

- Status-4-Evar 2011.03.21.22
Firefox 4.0 - 4.2a1pre

- WOT 20110323
Firefox 3.0 - 4.2a1pre