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Mozilla Firefox, Portable Edition 4.0.1 (web browser) Released

Submitted by John T. Haller on April 28, 2011 - 6:04pm
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Firefox is proud to announce the release of Mozilla Firefox®, Portable Edition 4.0.1 in 17 languages. It's the latest Mozilla Firefox browser bundled with a launcher as a portable app, so you can take your browser, bookmarks, settings and extensions on the go. It's open source and completely free. Read on for more details...

Update automatically in the Platform 2.0 Beta 5 by clicking 'Check for Updates'.

Mozilla®, Firefox® and the Firefox logo are registered trademarks of the Mozilla Foundation and are used under license.


FirefoxPortable_small.pngMozilla Firefox is a fast, full-featured web browser that's easy to use. It has lots of great features including popup-blocking, tabbed-browsing, integrated search, improved privacy features, automatic updating and more. Plus, thanks to the launcher bundled in the Mozilla Firefox, Portable Edition, it leaves no personal information behind on the machine you run it on, so you can take your favorite browser along with all your favorite bookmarks and extensions with you wherever you go. Learn more about Mozilla Firefox... Installer / Format

Mozilla Firefox, Portable Edition is packaged in a Installer so it will automatically detect an existing installation when your drive is plugged in. And it's in Format, so it automatically works with the Suite including the Menu and Backup Utility.


Mozilla Firefox, Portable Edition is available for immediate download from the Mozilla Firefox, Portable Edition homepage. You can get the German release from the German homepage and the other localized releases from the Localization page. Get it today!

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Couple things...

As of this posting, I see nothing about 4.0.1
I hate wasting sourceforge bandwidth on something unnecessary, so I usually check the release notes first. What is new with this?

Are they releasing the updates before the release is completed a la "Spaceballs: The Movie?"

Also, I noticed the badge next to "Like Firefox Portable? You'll love having Firefox on your PC" is for 3.6 but it links to a DL of 4.0.

Thank you!


Don't think the release notes will be posted til it's pushed to all users. Nearly every point release of Firefox has a security patch (as with other browser) and you should absolutely update.

Sometimes, the impossible can become possible, if you're awesome!

Release Notes: LINK

I've been busy IRL for the past month or two, but I'm back.

Thanks guys!

I'm just throwing this out there so no need to comment, but with FF's new extension update tab you can see release notes by just checking within the updater. Of course it is not a high priority at this point but I thought I'd throw it out there if it hasn't already...but that would be great if the PA updater offered the same.

Anyway, thank you for the link and explanation. For high use, web dependent apps like FF I usually update regardless as John suggests, but not for the Gimp, Libre Office, etc. I don't like using the time or drive writes to update minutia.

This one killed a lot of extension compatibility for me...

I know that's not really a Portableapps-problem, but could be interesting to know for people thinking about upgrading...

I lost compatibility to about 10 of my extensions after upgrading, which seems silly when it is a x.0.1 update.

Had to go back to Firefox 4.0 again...

extensions themselves

That means the extension developers themselves only listed them as compatible through 4.0 when they should have done a broader maxversion in their configuration.

Sometimes, the impossible can become possible, if you're awesome!


Hello John,

autoupdate does not work on PA.c Platform 2.0b5, for the german version of FF 4.0.1.


Worked Here

I just ran it in German and it worked exactly as expected. If you have an issue, please post a detailed error report in the forums with your install path, exact error message, current install location, current version, etc.

Sometimes, the impossible can become possible, if you're awesome!

couldn't investigate

Hello John,

I had a Firefoxportable 4.0 RC2 installed. I removed it and installed 4.0.1, don't know why it wont update!?

Same was with jportable update 25. I did a manual download and installed it manually.

Everything else updated fine (Thunderbird, Chrome)

Is there a logfile, where I can see what's going wrong?



4.0 RC2 is a test release installed to FirefoxPortableTest. It doesn't update to any stable releases. FirefoxPortable and FirefoxPortableTest are treated as two different apps.

jPortable is an add-on, not a portable app, and will not be updated by the current updater. This detailed on every jPortable release announcement.

Sometimes, the impossible can become possible, if you're awesome!


Hello John,

sorry, I didn't read that jPortable is an add-on. My fault. Even I didn't see before the first posting "autoupdate", that it was a FF 4.0 RC2 Test-Release.

Thank you for mentioning it.

Have a nice weekend. Smiling


Updating Firefox

Can Firefox be updated via the Help Menu (Help>About Firefox>Check For Updates)?