With Chrome extensions having been available for one week now, we thought it would be good to take a look at the 10 most popular extensions for the week.

Collectively, these top 10 extensions have almost had just under 500,000 million downloads.

Google Mail Checker

With over 108,000 users, this extension displays the number of unread messages in your Google Mail inbox. Clicking on the icon will open your inbox. Currently only gmail and googlemail domains work, so anyone using a personal domain with Google Apps is out. There is also a reported memory leak at this stage with some users suggesting the less popular (but just as good, if not better) Google Mail Checker Plus.

AdThwart

AdThwart has almost 70,000 users, with the extension blocking ads from websites, thus saving you bandwidth and valuable screen space. The ad filter list is constantly updated by the EasyList community.

Google Translate

With 63,000 users, Google Translate does exactly that – translates. Web pages can be translated into your chosen language with a single click. This extensions users Google Translate.

IE Tab

IE Tab has over 53,000 users and is of great use for web pages that do not load or open correctly in Google Chrome. As the name suggests, this extensions lets you open an Internet Explorer tab right in Google Chrome, without the need for changing browser.

Google Wave Notifier

This extension has almost 50,000 users, and is similar to the Google Mail Checker. With Google Wave Notifier you can see all your unread Waves, as well as accessing specific Waves with a single click. It’s also compatible with Waves setup on a Google Apps domain.

RSS Subscription Extension

RSS Subscription Extension has over 46,000 users, and allows users to subscribe to RSS feeds with a single click. 4 feed readers are defined by default (Google Reader, iGoogle, Bloglines and My Yahoo), but others can be added manually.

Xmark Bookmark Sync

With just under 40,000 users, this extension allows you to backup and sync bookmarks across computers and browsers. The extension is also available for Firefox, Safari, and IE.

Docs PDF/PowerPoint Viewer

This extension has over 37,000 users and allows users to automatically preview both PDF and PowerPoint documents in Google Docs Viewer. This can save you lots of time, especially if the document is rather large.

AdBlock

Famous among Firefox users, AdBlock does what it says – it blocks ads from websites. The extension has over 36,000 users and the block list is automatically updated. This is the second ad blocker in the top ten.

Google Quick Scroll

Rounding out the top 10 is Google Quick Scroll, with almost 33,000 users. Google Quick Scroll lets users jump directly to the important bits when performing Google searches. After clicking on a search result, and when deemed to be useful, a small pop-up window appears showing one or more bits of the page that are relevant to your search. An obvious time saver!

That’s the top 10 extensions one week on, with extensions being available for Chrome Beta on Windows and Linux. Mac users unfortunately miss out at this point. Many, many more extensions can also be found on the Google Chrome Extensions website.

Google Chrome Gmail Checker Extension

With the latest Beta releases of Google Chrome today, Google have also released Extensions Beta.

Available to Beta Chrome users on Windows and Linux (with Mac still in progress), over 300 extensions can be downloaded at today’s launch.

Extensions can let users check their Gmail, translate web pages into different languages, and watch eBay items all without the need to visit actual websites.

Extensions have flourished in Mozilla Firefox, otherwise known as add-ons, and have helped grow the browsers fan base.

The extensions are all free and can be downloaded from the Google Chrome Extensions website.

Google has finally released Chrome Beta for both Mac and Linux.

Version 4.0.249.30 has been promoted to the Beta channel for Windows, Mac and Linux.

Mac users who had a previous developer  build installed will automatically be moved to the Beta channel.

Chrome on Linux is integrated tightly with native GTX themes, while updates are managed by the standard system package manager.

Mac users will also notice that Chrome has a native Mac OS X graphical user interface.

Download links are below:

• Download Google Chrome Beta for Windows
• Download Google Chrome Beta for Mac
• Download Google Chrome Beta for Linux

TechCrunch has received word from Google that Google Chrome for Mac is indeed scheduled for release in December this year.

“As I’m sure you know, we generally don’t comment about timelines for releasing specific features or products. But we’ve been quoted a few times saying Chrome for mac should be out by the end of the year” said the Google spokesperson.

The release is expected to be similar to the Windows release, with a beta version released first, with a stable release coming within weeks of its initial greater public release.

We will keep you updated as more news on this story comes in.

Google has just pushed out Chrome 3.0.195.33 stable. The update fixes two potential problems.

The first issue is a simple bug fix, which would cause Google Chrome to stop working if a required Windows DLL (t2embed.dll) was not found, or not readable by the browser. This DLL is no longer needed by Chrome from this release.

The second issues closes a security hole, which has a low severity rating. The hole would allow “custom headers incorrectly sent for CORS OPTIONS request”.

The update will be pushed out automatically to existing users, while new users can download Google Chrome from the Chrome website.

Google has pushed out a new version of Chrome 3, taking it to version 3.0.195.32. The release fixes 5 stability issues, and plugs 2 security vulnerabilities.

The first security issue which was rated as medium where user were not warned for some file types that could execute JavaScript. The second security issue was rated as high and could have caused a memory corruption in the Gears plugin.

The update will be pushed out to existing Chrome users, or can be downloaded from the Google Chrome website.

The developers of Google Chrome have moved a branch of Chrome 4 to the Beta channel, meaning that the browser is stable enough now for a larger testing audience.

Chrome 4.0.223.16 beta is available only for Windows at this stage, but includes bookmark sync. Extension support is however disabled at this time (though is still available in the dev channel releases).

You can download the latest beta version from Google.

Below is a video from Google demonstrating bookmark sync.

Google has pushed out a new version of Google Chrome to users, version 3.0.195.27.

The releases fixes a few issues:

• Fixed an issue where menu items for certain Indian languages were not properly visible.
• Add support to blacklist the faux www.paypal.com certificate.
• Added NTLMv2 support on Windows.
• FFmpeg files now properly have NX/DBCompat enabled.
• V8 crash fix.

The update will be pushed out to current Chrome users automatically, or can be downloaded from the Google Chrome website.

Just days after the last update, Google has pushed out another update to Chrome.

This time it is just a small aesthetic change, and in no way relates to any browser security issues.

“This release includes only a single change that adds an image link to the new tab page which directs new users to the themes gallery.” says a note from Google.

As usual, the update will be pushed out to current Chrome users, or can be downloaded directly from the Google Chrome website.

Google has pushed out a new Chrome release to the stable, taking Chrome 3 to version 3.0.195.24.

The update fixes one security hole in the V8 JavaScript engine which is rated as high severity and could allow an attacker to run arbitrary code in the Google Chrome sandbox.

As usual, the browser will be pushed out to current Chrome users, or can be downloaded directly from the Google Chrome website for new users.