Firefox Portable

I know that there's no support for developer previews and nightly builds but I want to ask if it's possible to fix the current nightly build which is avaiable as portable app. Even if I run the installer it crashes while downloading the latest nightly build showing up the following message:

The installer was unable to download Current Minefield Trunk Build.
The installation of the portable app will be incomplete without it.
(ERROR: File Not Found (404))

Hello. I want to know how to change icon in firefox portable. I try to change all icons in FirefoxPortable\App\AppInfo but nothing happens. Please help.

This may be a silly question or sound elementary. I use Win XP SP3. Can I run portable apps like Open Office, Abiword, etc from USB drive on an Apple computer?

Can I rename FirefoxPortable folder without side effects? For example, rename to FirefoxPortable 3.5.9., then install a newer version of FirefoxPortable to folder FirefoxPortable?

Actually this is not part of the FAQ, so bear with my question.

I was happy with FF portable 3.5.9. where I run 50+ add ons without problem. I then decided to upgrade to 3.6.3. Here is what I did:

1. Make a safe copy of FirefoxPortable to FirefoxPortable 3.5.9.

2. Unzip the firefox portable 3.6.3. and dump it to the existing FirefoxPortable folder

Someone has added a "new" Mozilla Firefox 3.6.4, but when I install it, it is in fact Mozilla Firefox 3.6.3.

Did someone make a mistake?

Hi!
How to install Gtalk plugin in Firefox portable with voice and video support?

Tired of manually keeping the flashplayer.xpt and NPSWF32.dll files synchronized between your system directory and your Portable Firefox directory? If you're running Windows Vista or later, symbolic links can help.

Dear moderator,

Is there a chance in the near future for a correct file version FF3.64 Dutch?
Are these files ever checked before published?

I got a notice telling me to upgrade firefox and restart, but after that, attempting to run it only brings up the preloader graphic. I tried installing firefox on another USB drive to see if it's just the computer, but the newly installed one worked fine.

So is this recoverable? And if it isn't, how can I move my stuff to a new copy of firefox portable without also copying the bug?