Stainless brings multi-process browsing to the Mac, a la Google Chrome" />

Stainless 0.7.5 Multi-Purpose Web Browser Released - Now With Session Restore

12966 Mesa Dynamics has released a technology preview of Stainless, which they claim to the first multi-process web browser for OS X, inspired by Google Chrome. Each tab in Stainless runs in a separate process.


So, why did they create yet-another-WebKit-browser? Because, the company says, building a multi-process browser for OS X was a cool way to leverage the multi-processing technology they developed for one of their products, Hypercube.

Mesa Dynamics, LLC says:

Although Stainless started out as a technology demo to showcase our own multi-processing architecture in response to Google Chrome, we've been inspired by our growing fanbase to forge ahead and craft Stainless into a full-fledged browser. In fact, Stainless now has features you won't find in Chrome or in any other browser.


A prime example is parallel sessions, which allow you to log into a site using different credentials in separate tabs at the same time. This new technology is woven throughout Stainless, from the private cookie storage system, to session-aware bookmarks that remember the session in which they were saved. We're excited to showcase what we believe is a true browser innovation.

Please note that Stainless is in early development. The current version is still short of features you'd expect in a production-ready browser, but that will change as we move towards a 1.0 release. As we do so, you can check out what's new in every update by viewing our release notes

Like Chrome, Stainless also has tabs that can be dragged between windows, a unified address and search bar, and a private browsing mode.

It's pretty bare bones - looks like a stripped-down version of Safari, which is of course due to its Webkit underpinnings. It didn't blow me away with speed over my poky dialup connection, there are no Bookmarks or preferences beyond a search engine configurator included, and it didn;t deliver on the claim of "increased stability", managing to lock up my computer and requiring a hard force reboot. An interesting exercise I guess, but I hope Chrome when it arrives for the Mac offers a better browsing experience than this.

The release blurb does note that judging from Chromium's OS X Detailed Status page, the Mac version of Chrome will use a WebCore-rendered bitmap to pass between the browser and rendering processes. The strategy Mesa Dynamics uses in Hypercube (and now Stainless) is far less impressive, but a whole lot easier to do and, thus, available today.

New in version 0.7.5:
• added: url and search autocompletion
• added: new theme-capable UI (API available in future version)
• added: new tab and security preferences
• fixed: nested group contextual menus don't work
• fixed: create groups from open tabs fails when no tabs are open
• fixed: switching to empty tab group doesn't update bookmarks

System requirements:
Mac OS X 10.5 ("Leopard")

System Support:

Stainless is freeware

Version 0.1 is available immediately for download at

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