Firefox 7 will use up to 50% less memory

Since its first release back in 2004 Firefox has been my web browser of choice. It was the first browser to give Microsoft some serious competition and soon took over as the better choice for those in the know.
Google Chrome has come along since and injected a lot of speed into browsing the web, and Firefox has duly responded and even outperforms it easily in some tasks, but it does have one niggling problem that users regular complain about: memory use and memory leaks.

If you leave Firefox running for any length of time its memory footprint seems to keep increasing. This can escalate to the point where it stops responding and there’s nothing to do but restart the browser. Personally, I’ve seen this problem have less of an impact during my daily usage since moving to Firefox 5, but it’s still there.
Mozilla knows this problem exists and aims to fix it. By the time we see Firefox 7 available for download it will use as much as 50% less memory than any version that has gone before, as well as having those problematic memory leaks fixed.

Posting on his personal blog, Mozilla developer Nicholas Nethercote has stated that Firefox 7 will be noticeably faster. You will be able to leave it running overnight without issue, and closing tabs will free up memory. The reason for this is a new Mozilla project called MemShrink.
MemShrink is an internal effort that focuses on improving Firefox’s speed, stability, and perception. Speed will come in the form of less paging and less pressure on the cache. By sorting out the paging the stability will improve due to fewer out of memory crashes. The perception improvement comes from a combination of the two other goals of MemShrink: fewer crashes and better performance takes the perception of the browser up.
Endurance testing carried out at Mozilla using synthetic tests has already proved that MemShrink is going to mean significant savings in memory use as the following charts show:

Amazon issues Kindle Cloud Reader, sidestepping Apple's subscription rules

If you can’t beat the rules, go around ‘em. That seems to be the idea behind Amazon’s new Web-based Kindle Cloud Reader, a transparent attempt to give iPad readers direct access to both their Kindle books and the Amazon bookstore without cutting Apple a 30-percent slice of the pie. 
Amazon’s launch of the iPad-optimized Web service is the latest blow in a battle that has been brewing since February, when Apple announced it would take a 30 percent cut of sales made through in-app purchases of books, periodicals, music, and movies—and that sellers couldn’t use their websites to offer better deals than available through the apps. Cupertino later relaxed its requirements a bit, but still mandated that Amazon and other ebook app vendors scrub their apps of direct links to their online stores. And the Financial Times showed a new way forward in June by offering one of the first subscription-based iPad-optimized websites.

Amazon is following the Financial Times model with the Kindle Cloud Reader; while its new read.amazon.com site is also compatible with the Chrome and Safari desktop browsers, the site is clearly aimed at iPad Safari users. (An iPhone version isn’t available yet.) When you log into your Amazon account from within the app for the first time, you’re shown your entire library of ebooks—and prompted to add the page to your iPad’s home screen. The Web app claims 50MB of storage space on your iPad, which in turn gives you the ability to store cloud-based books for offline reading.

The Web app comes with a number of downsides; it simply doesn’t offer as alluring a reading experience as the official iPad app. For one thing, there’s no access to periodicals: If you recently started subscribing to newspapers or magazines through Amazon, you’ll need to stick with the iPad app. The same goes for the ability to share book quotes via Facebook and Twitter. And there’s no highlighting or note-taking enabled—though you can see the highlights and notes you’ve made using Amazon’s other Kindle apps (or actual hardware Kindles). Even the page-turning is little bit uglier: Readers merely tap to change screens instead of “swiping” back-and-forth. If anything, the experience is closer to the desktop Kindle app than the iPad app.

The only clear advantage to the Web app, in fact, seems to be the easy access to Amazon’s store. The iPad-optimized store is beautifully designed, with a narrow-but-total focus on Kindle publications instead of the vast grab-bag of products and services available at Amazon.com. Unless or until Amazon can match the elegance of its new iPad-friendly ebook store with its cloud-based reading experience, though, the Web app won’t become a true page-turner.