Mozilla Firefox®, Portable Edition is the popular Mozilla Firefox web browser bundled with a PortableApps.com Launcher as a portable app, so you can take your bookmarks, extensions and saved passwords with you. We saw how to set Firefox Portable as the default Web browser in Windows XP. Here is a tool which can register Mozilla Firefox Portable Edition with the Default Programs tool in Windows Vista.
Register Firefox Portable with Default Programs
1. Download registerfp.zip and save to Desktop.
2. Unzip the archive and extract the contents to a folder.
3. Double-click the file RegisterFirefoxPortable.exe to run it
4. When you see the User Account Control dialog, click Allow

5. Click the Browse button and locate the Firefox Portable executable

6. Click Register

Editor’s note: If the drive letter for your removable device (which contains Firefox Portable) changes, you’ll need to re-register the program using this utility.
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[...] source: Register Firefox Portable with Default Programs in Windows Vista [...]
Yes, it works with Windows 7 RC. Select the .exe file and make it run in compatibility mode with Vista, then go to the Contro Panel – Programs (Software) – Default Programs (Software) and click in the Firefox Portable to select type of files to be opened by Firefox Portable.
not work on windows 7
Woohoo! this is just what I needed thank you very much! oh if you’re wondering this program worked fine on Vista 64 SP2 RC1 =)
it is lovely program, fix all the problems I had
cheers
Ramesh and @Paul,
I have to agree with Paul. It would be great to see this generalized.
For instance, I try to use as many portable apps as possible, even running off my HDD, because I have to restructure partitions frequently. Each time I move the directory, Default Programs breaks badly — it would let me register the portable app the first time, and subsequently it will not — the option doesn’t show up again. I have yet to find an easy fix, though I am about to try the OpenWithAdd fix you once supplied.
There are a lot of things I use regularly in portable editions, like Foxit PDF Reader Portable (which is a hack) and ImgBurn, to name just two.
Is it possible to generalize this? I use a lot of portable programs and would love to have them as defaults. Sometimes Vista will let me browse to and choose them but mostly, not so much.
A specific issue is Thunderbird portable for email.
You have wonderful information here. I’m sorry I had not discovered you before.
—–Paul——
[...] Howto: Register Firefox Portable as the default Windows browser August 27, 2008 — Julie Ramesh has written some instructions detailing how to register Firefox Portable as the default browser for Windows XP and Windows Vista. [...]