Mozilla Firefox, Portable Edition 3.1 Beta 1 Released

John T. Haller's picture
Submitted by John T. Haller on October 15, 2008 - 5:05pm

Firefox logoMozilla Firefox®, Portable Edition 3.1 Beta 1 has been released in English, German, French, Italian, Japanese and Simplified Chinese. It's the latest test release of the upcoming Mozilla Firefox 3 web browser bundled with a launcher as a portable app, so you can take your browser, bookmarks, settings and extensions on the go. It's also a great way to test out all the new features of 3.1 without affecting your existing Firefox installation. This new release updates Firefox to 3.1 Beta 1 and has an updated launcher. It's packaged in Format so it can easily integrate with the Suite. And it's open source and completely free.

Read on for more details...

Mozilla Firefox 3.1 Beta 1

Mozilla Firefox 3.1 Beta 1 is the latest test release of the upcoming 3.1 version of Firefox. It has new features, security enhancements, performance upgrades and more. And, thanks to the packaging, you can try out all the new features without impacting your locally-installed copy of Firefox. For more on what's new, read the Mozilla Firefox 3.1 Beta 1 Release Notes.

New In This Release

This release updates Firefox to 3.1 Beta 1 (release notes) and has an improved launcher. 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 3.1 Beta 1 homepage. French, German, Italian, Japanese and Simplified Chinese are available from the Localization page. Get it today!

Story Topic:


I'm trying to assess how much "harm" is being done (in terms of reducing shelf-life) to my flash drive by using Portable Firefox. Obviously, or so I think, I should use the local version of Firefox (if it exists). Or is Portable Firefox "safe" enough (referring again to reducing shelf-life) to use whenever I'm away from my home computer?

Right now I only have cookies enabled and session restore active. I have 0MB for cache and it doesn't save the history, form data, or passwords.

I used Process Monitor to see how much saving was being done, and it seemed to be saving a lot of files, so wanted to ask others for their advice.

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John T. Haller's picture

As always, please post support questions in the support forums and not as comments on a news story. That way everyone can see the question and others can easily find it later.

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I think this question belongs here because it's not answered on the page itself.

Where does this get installed when run? The browser I'm using (3.0.3) is in the PortableApps directory under Firefox Portable.

Will this Beta overwrite that?

It will install to FirefoxPortableTest, as will all other application betas typically.

I don't know if this is a bug but each time I type in a URL address in the navigation toolbar, I get the following error message:

Assertion Failed

ASSERT: *** Search: _installLocation: engine has no file!
Stack Trace:
0:ENSURE_WARN(false,_installLocation: engine has no file!,2147500037)
4:epsGetAttr([object Object],alias)
8:getShortcutOrURI(www,,[object Object])
9:_canonizeURL([object KeyboardEvent])
10:handleCommand([object KeyboardEvent])
11:anonymous(textentered,[object KeyboardEvent])
12:fireEvent(textentered,[object KeyboardEvent])
15:onKeyPress([object KeyboardEvent])
16:onxblkeypress([object KeyboardEvent])

Consequently, the only way I can go to a particular website is to use my bookmarks or do a google search and use the link displayed. What gives?