Webware

The present interface for developers to upload their Chrome extensions.

(Credit: Screenshot by Stephen Shankland/CNET)

Google has opened up its gallery for developers to share Chrome extensions, a step that soon should make it easier for people to customize the open-source browser.

Aaron Boodman, a leader of the Chrome extensions effort, announced the move on a mailing list posting Monday, and programmer and "gallery master" Lei Zheng shared details in a blog post.

So far, only uploads are permitted. Google plans to let some testers use the gallery to download extensions, too "in the next few days," Zheng said. "We are making the upload flow available early to make sure that developers have the time to publish their extensions ahead of our full launch."

Extensions, a major asset of the Firefox browser and the headline feature of the upcoming Chrome 4 beta, let people modify the browser more to their liking. With them, the browser itself doesn't have to be bogged down with numerous features and configuration options that most people don't want.

One feature of Google's system is that add-ons are automatically updated on Chrome users' computers once the developer uploads a new version.

For developers, the extensions gallery comes with a set of terms and conditions.

One nugget in the legalese: expect Google to use a rating system, as it does for other sites including Android applications and YouTube videos. It's all part of Google's philosophy of using user data to help automatically manage its Web properties in a way that, the company hopes, will be helpful to those who use its sites.

According to the terms and conditions: "The gallery will allow users to rate products. Along with other factors, product ratings may be used to determine the placement of products on the gallery with higher rated products generally given better placement, subject to Google's right to change placement at Google's sole discretion. For new developers without product history, Google may use or publish performance measurements such as uninstall rates to identify or remove products that are not meeting acceptable standards, as determined by Google."

The developer preview version of Chrome now promotes an as-yet unworking link to an extensions gallery.

(Credit: Screenshot by Stephen Shankland/CNET)

Google is on the verge of launching a Web site to showcase its extensions to customize what its browser can do.

The company's latest developer preview edition, Chrome 4.0.249.0, promotes the feature on its opening screen and its new-tab page. "New! Google Chrome now has extensions and bookmark sync," the page reads, offering a link to a site that's not public yet, https://chrome.google.com/extensions. (Bookmark sync is already available.)

Extensions and support for Mac OS X and Linux are the headline features of Chrome 4.0. It's available as a beta for Windows, with Mac OS X and Linux beta availability expected in early December. According to the Chromium development calendar, the beta is planned for December 8 release and the stable release of Chrome 4.0 is due January 12.

A number of third-party galleries for Chrome extensions already are available, but programmers for the project have said on mailing lists that a Google site is planned. Earlier this year, Google shipped a version of Chrome that pointed to a collection of visual themes before the Chrome themes gallery was actually live to the public.

Extensions are a key asset of one Chrome competitor, Mozilla's Firefox; extensions permit people to customize the browser and add new features without burdening the overall project. Firefox is getting a new extensions framework, Jetpack, starting with version 3.7 due in the first half of 2010, and Mozilla has just launched its own Jetpack gallery.

Google plans to release a Mac beta of Chrome in early December, judging by some chatter on a mailing list for the browser.

Chrome 4.0 is available today as a beta version for Windows but only as a rougher developer-preview version on Linux and Mac OS X. The standout feature of the new version is customization through extensions, a technology that long has been a core asset of another open-source browser, Firefox.

Google has been moving to a new extensions presentation technology called Browser Actions that let people interact with extensions through a small button toward the upper right of the browser window. "We've noticed that many of you have updated your extensions to take advantage of the new UI. We'd like to encourage the rest of you to do so as well," said Nick Baum, a Google Chrome product manager, in a mailing list posting.

But here's the hitch: Browser Actions only work on Windows and Linux right now. That means those building extensions will leave Mac Chrome users behind for a time. But in telling those developers they won't have long to wait, Baum mentioned the deadline for the beta version.

"The earlier you switch, the more time you will have to polish your experience for our Beta launch in early December," he said.

And Google is on the case for adding Browser Actions to the Mac version of Chrome.

"We realize this means dropping Mac support for a couple of weeks, but we already have people working on that," Baum said. "If you prioritize the Windows and Linux versions, we'll bring you cross-platform parity as soon as we can!"

More people will get a chance to try out bookmark synchronization with Monday's release of a beta version of Google Chrome for Windows.

Google introduced the bookmark sync feature for the developer-preview version in August, but now it's also in the better-tested beta version, Chrome 4.0.223.16. However, there's still no Chrome beta for Mac OS X or Linux.

In a video explanation, Google's Anthony LaForge somewhat breathlessly describes how the sync feature can keep bookmarks the same on multiple machines. That's a fair point, but let's be realistic here--bookmark sync in Chrome is more catch-up than paradigm shift. Indeed, with the popular Xmarks extension--in the works for Chrome, people can synchronize bookmarks among multiple browsers, not merely multiple computers.

And Chrome's clever message-based sync technology notwithstanding, Chrome bookmarks would be a lot more magical if they synchronized with the Google bookmarks service, which is linked with iGoogle and the Google Toolbar.

Speaking of extensions, one of the 4.x series' biggest features is the ability to accommodate extensions, but because Google is shifting the extensions interface, the feature isn't enabled in the beta version. Chrome is released in three versions: the roughest, fastest moving developer preview, the more stable beta, and the stable edition for the broadest audience.

The 4.x series has other significant features, too, though it's not clear whether they'll arrive in the beta or stable versions. One is Google's Native Client, which lets JavaScript applications take more direct advantage of a PC processor's horsepower through a careful security mechanism. Another is WebGL, a 3D interface that does the same with hardware-accelerated graphics.

Together, the features have the potential to dramatically improve the power and sophistication of Web-based applications. That's particularly interesting given that Google is building Chrome OS, a browser-based operating system.

The Mac version isn't in beta yet, but it's a priority.

"Our goal for this Friday is to be able to count our Mac P1 M4 release blocker bugs on one hand (we're in the 20s now)," said Chrome programmer Mike Pinkerton in a mailing list announcement on Monday. P1 bugs are priority-one; M4 refers to milestone 4, or version 4.0.

And Google is willing to put more manpower onto the Mac version, he added. "Everyone should have their P1 list practically at zero by the end of this week. If you are not going to be able to reach this, let me (or other triage folk) know ASAP so that we can get you some help.

Chrome edged up to 3.6 percent of browser usage for October, its highest showing so far in Net Applications' statistics since the browser's first public release 14 months ago. That's within striking distance of third-place Safari at 4.2 percent, but still well short of second-place Firefox at 24.1 percent and dominant Internet Explorer at 64.6 percent.

Chrome has helped fan the browser war flames even without becoming dominant, though. In particular, it's helped increase the emphasis on performance such as the speed to load the software, load Web pages, and run Web-based JavaScript applications. Here, more than with bookmark sync, Google's chest-thumping has some merit:

"As with every release, this new beta comes with many speed improvements. In particular, as Web applications we use every day become increasingly dynamic, browsers like Google Chrome need to be able to construct and change elements on web pages as fast as possible," said programmers Idan Avraham and Anton Muhin in a blog post. "We've improved performance scores on Google Chrome by 30 percent since our current stable release, as measured by Mozilla's Dromeao DOM Core Tests, and by 400 percent since our first stable release."

There has been some slowdown with the arrival of Chrome extensions, though, so Google will have some more optimization work to do to keep the browser in fighting trim.

Updated 9:57 p.m. PST with further details on the Mac OS X beta priority.

Those of you who hate the recent arrival of Yahoo's logo on Flickr now have an easy way to erase it--and get a number of useful features--as long as you're using an edgy version of Chrome.

Fittr Flickr lets you click 'EXIF' to expand a box below the image to show photo details.

(Credit: Stephen Shankland/CNET)

Chrome extensions let people customize the browser's behavior, and the Fittr Flickr extension from Gmail programmer Dan Pupius whips Yahoo's photo-sharing site into shape. Some people use extensions for using Delicious bookmarks, banishing ads, and filling out forms, but this is my favorite Chrome extension so far. You can also download Fittr from Download.com.

The Yahoo logo is ugly but not too bothersome in my eyes. Instead, what I like best about Fittr Flickr is its keyboard navigation options. Once the extension is installed, you can type "?" to see the options, but the two I now use a lot are "." and "," to navigate forward and backward through a person's photostream. Typing "s" will star a photo as a favorite, and in a nice Google touch harkening to the vi text editor, "/" will put your cursor in the search field.

Google's browser now has an extension to use the Web of Trust, a project that lets people rate the trustworthiness of Web sites and see how others have rated them.

The open-source plug-in previously worked only with Firefox and Internet Explorer, but now a version is available for the new developer preview version of Chrome, according to a blog post.

The Web of Trust extension lets people rate Web pages. Clicking an icon in the lower left corner of Chrome pops up this interface.

(Credit: Screenshot by Stephen Shankland/CNET)

It's one of a host of relatively widely used extensions available on other browsers but now on their way to Chrome, whose extensions framework is just getting off the ground. There also are extensions (called add-ons in the Firefox realm) for Delicious and Xmarks, for example.

The extension takes advantage of the newer "mole" feature that lets windows pop up from the bottom of the screen. (The "mole" term originated with the work Google's Gmail team on instant-message windows; closing a number of them is like playing Whack-a-Mole.) However, Web of Trust programmers are considering using a newer extensions possibility called browser actions, which builds an extension interface into a button that appears along the top of the Chrome window.

"Browser Actions look promising though and we're looking forward to using them in future," said programmer Sami Tolvanen in a mailing list announcement. He also offered a list of suggestions for the Chrome extensions interface.

Separately, Google announced a new developer preview version, Chrome 4.0.221.6 for Windows, 4.0.221.8 for Mac OS X, and 4.0.221.8 for Linux. In the Windows version is a new browser action feature, pop-up windows.

Support for extensions to customize Chrome, the top-requested feature for Google's browser, has begun arriving for adventurous users.

Previously, extensions worked only for those who enabled the feature with a command line switch. Now the feature is enabled by default in the developer preview version of Chrome on Windows, Aaron Boodman, the Google engineer who oversees the extensions work, said in a blog post Wednesday.

"We're ready for a few more people to start using extensions--the kind of adventurous people who populate the dev channel," said Boodman, who earlier in his career developed the Greasemonkey tool that permitted extensive customization of Firefox.

Work is already under way for some popular extensions, including Yahoo's Delicious for social bookmarking and Xmarks for bookmark synchronization.

Extensions are enabled by default only for Chrome's Windows users right now. "We've also enlisted some help to get extensions up to speed on Mac and Linux," Boodman said.

The extension-programming interfaces have been changing, and more changes are coming to the user interface. Those who want to start developing extensions should look at the new Chrome extension documentation.

Chrome extensions are written with the same programming technologies as are used for Web pages themselves--HTML, CSS, and the like. Mozilla has a related extension effort called Jetpack under way for Firefox.

Some selected Chrome users who want to synchronize browser bookmarks with their other browsers now can get a start.

Xmarks, whose browser addition can keep bookmarks synced across Firefox, Internet Explorer, and the Mac OS X version of Safari, has released an alpha version of a Chrome extension to selected testers.

"We've been swamped with requests to create a version of Xmarks for the Google Chrome browser. We're hard at work on that and, thanks to some new APIs (application programming interfaces) from Google, are pleased to report that we have Xmarks synchronization working in the Windows developer channel for Chrome," Xmarks' Colin Bleckner said on the Xmarks blog Sunday. Xmarks formerly was called Foxmarks.

"We're doing this (closed test) so we can catch any serious issues we may have missed before letting thousands of users try it out. Hopefully we'll be able to ramp up our user count quickly," Bleckner said in a mailing list message.

The move comes just after Google released its own bookmark synchronization feature in the Windows version of Chrome, but it doesn't synchronize bookmarks with other browsers or even with the Google Bookmarks service.

Google is working hard on its extensions support in Chrome, but the feature remains a work in progress. Indeed, Aaron Boodman, a Chrome extensions developer, marveled that Xmarks produced even an alpha given the pace of change. "I'm shocked you could get anything at all done with us breaking everything every other release," he said in a mailing list message about Xmarks' announcement.

Another early extension for Chrome, one for Yahoo's Delicious bookmarks service, also is available.

One of the better Mozilla Thunderbird extensions is ThunderBrowse, which allows users to quickly open e-mailed links in a browser window built into the e-mail client itself. The latest version introduces support for the Thunderbird-derived Postbox, as well as compatibility fixes for the Thunderbird 3 beta builds and a new click engine.

ThunderBrowse now offers tab support in Thunderbird.

(Credit: Screenshot by Seth Rosenblatt/CNET)

However, for users who haven't checked out or updated ThunderBrowse in awhile, there's a lot to play with. Through the expansive options menu, you can configure links to open in new tabs. This allows your original e-mail to stay open in one tab, while the link has been opened in a new one. Unfortunately, in the Thunderbird 3 betas, this does not open a new Thunderbird tab--you'll only get a new ThunderBrowse tab in your message pane. Even if the pane is maximized or the message has been open in a new tab, you'll find a slightly cumbersome new tab bar opening beneath the URL bar.

Other new or recently added options in ThunderBrowse include customizing an external browser to open e-mailed links that's different from your system's default browser, greater control over behavior after left-clicking and scroll wheel-clicking links, and enhanced user security through permission control for JavaScript, images, plug-ins, and cookies. There's also a new auto-complete feature and the ability to move the ThunderBrowse URL bar to the bottom of the pane.