Chromium Blog
News and developments from the open source browser project
A Mini-Newsletter From Your Google Chrome Security Team
Tuesday, March 8, 2011
We’re always working hard to enhance the Chrome browser with bug fixes, new defenses and new features. The
release of Chrome 10
is no different, and there are some items worth highlighting:
Chrome 10: Flash sandboxing
With Chrome 10, our first cut of the previously announced
Flash sandboxing initiative
is now enabled by default for the Windows platform on Vista and newer. Additionally, because we automatically update Flash to the latest and most secure version, this should provide useful defense in depth.
Chrome 10: Out-of-date plug-in warnings
As we
previously mentioned
, we believe that some of the most significant opportunities to increase user security revolve around plugins. We’ve made a number of improvements in this area, including actively encouraging users to update their plug-ins to the most secure version. Chrome now detects when a plug-in is out of date and blocks it with a simple infobar. This infobar helps guide the user towards updating their plug-in with the latest security fixes.
Chrome 10: Plug-in blocking enhancements
Some of our more advanced users prefer fine-grained control over which plug-ins they wish to run -- which can have security and privacy benefits. Chrome has long had a feature which blocks plug-ins by default (Wrench menu -> Preferences -> Under the hood -> Content Settings -> Plug-ins). We’ve improved this feature by adding a context menu to the blocked plug-in placeholder. This menu lets users control which plug-ins do and do not run. Using a context menu helps prevent clickjacking attacks that try to bypass the block. Plug-in placeholders can also be hidden (for example, if they are floating over and obscuring real content), and the actual plug-in that wishes to run is made apparent.
Chromium Security Rewards program still going strong
We mentioned in passing in the
9.0.597.107 release notes
that our
rewards program
has passed $100,000 of rewards. We’d like to re-iterate our thanks to all the named researchers in our
Hall of Fame
. We’re continually delighted with the stream of interesting and clever bugs that we receive, so it will be exciting to see what the rest of 2011 brings. Remember, we love giving out money!
Still hiring!
We are always looking to expand the Google Chrome Security Team, and we’re looking for a wide range of talents. We can promise exciting and varied work, working to protect hundreds of millions of users and working alongside the best in the industry. Why not have a look at
our job posting
?
Posted by Chris Evans, Google Chrome Security Team, Bernhard Bauer, Software Engineer, and Carlos Pizano, Software Engineer
GPU acceleration + old drivers = :(
Tuesday, March 1, 2011
Over the last few months, we’ve made a lot of progress using graphics hardware (commonly referred to as the GPU) to make Chrome faster and more power-efficient. However, as we’ve rolled out features like WebGL and GPU-accelerated HTML5 video, we noticed a troubling trend: users with old graphics drivers experienced a significant increase in crashes when using these features. Because stability is one of Google Chrome’s core principles, we’ve recently become stricter about requiring up-to-date drivers and graphics hardware by adding ranges of old drivers to Google Chrome’s software rendering list.
Developers should continue to ensure that the software-rendered version of their sites work properly for users without GPU-accelerated browsers, so we expect most content to continue to function normally for Google Chrome users with out-of-date drivers -- albeit, without the same performance you might expect from Chrome. WebGL content on out-of-date systems will currently not display, but we are working to provide a software path so that these systems can run basic 3D applications.
As our ability to determine whether a machine can reliably use GPU features improves, we hope to extend hardware acceleration support to more and more users. Here are some steps you can take to maximize the chances that Chrome will run fully hardware-accelerated on your computer:
Use the latest major version of your operating system (such as Windows 7 or Mac OS 10.6)
Install
all system updates and driver updates
that are available for your system.
Posted by Henry Bridge, Product Manager
Chrome Developer Tools: Back to Basics
Thursday, February 24, 2011
It’s been an exciting past few months in the
Google Chrome Developer Tools
world as we keep adding new features, while polishing up existing ones to respond to your feedback.
One of the areas we have focused a lot of our energy is on network instrumentation. Recently we’ve made many improvements that will hopefully improve your experience when using Chrome Developer Tools. These improvements include:
Network aspects of your web page are now inspected in the
Network panel
. This gives you access to even more information at a single glance. You can sort and clear data, preserve log information upon navigation and even export network data into
HAR
format.
All the timing information about your resource loads now comes from the network stack, not WebKit, so timing information now adequately represents raw network timing. You can see detailed timing for different phases of the loading by hovering over the log entry.
We now push raw HTTP headers and status messages into Chrome Developer Tools. As a result, you now see precisely what the browser received from the server and not just how the rendering engine interpreted that information.
Similarly to the old Resources panel, you can see syntax-highlighted resource contents.
We’ve also made CSS editing a whole lot easier. In particular, you’ll now find separate fields for property names and values instead of a single field for both. As you type, you will see suggestions of available keywords for property values.
But that’s only the tip of the iceberg. Similar to the changes in the network panel, the
CSS sidebar
now shows the raw information that the browser gets from the server - not the rendering engine’s interpretation of the information. As a result, you can use Chrome Developer Tools to see CSS properties that are not recognized by WebKit (e.g., engine-specific or simply erroneous properties). This finally puts an end to the nightmare of disappearing invalid properties.
For a more complete reference on working with the Chrome Developer Tools, check out our new
home page
. The CSS improvements that we implemented upstream in WebKit are further described in our
WebKit blog post
. And for even more tips on how to use Chrome Developer Tools, watch the new video below.
Posted by Pavel Feldman and Alexander Pavlov, Software Engineers
Amping Up Chrome’s Background Feature
Wednesday, February 23, 2011
Many users rely on apps to provide timely notifications for things like calendar events and incoming chat messages, but find it cumbersome to always keep a Chrome window open. Extensions and packaged apps can already display notifications and maintain state without any visible windows, using
background pages
. This functionality is now available to hosted apps - the most common form of apps in the
Chrome Web Store
- via a new background window mechanism.
Apps and extensions that use the new “background” feature can continue to run in the background—even if the user closes down all of Chrome’s windows. “Background apps” will continue to run until Chrome exits. The next time Chrome starts up, any background windows that were previously running will also be re-launched. These windows are not going to be visible but they will be able to perform tasks like checking for server-side changes and pre-emptively loading content into local storage.
One way you can use background windows is to preload content and data so that they are immediately available when the user opens your app. You could also issue HTML5 notifications to alert the user when important events occur—for example, a friend wants to initiate a chat session. There are plenty of possibilities here, and we look forward to seeing what you’ll do.
To protect our users’ privacy, we’ve made this functionality available only to apps and extensions; regular websites will not be able to open background windows. Developers will also need to declare the “background” capability on their apps.
Users can easily see which background apps (and extensions) are running in their system through the “Background Apps” menu of the Chrome icon in the system tray (Windows/Linux) or dock (Mac). Chrome will automatically load background components when the user logs in, and the Chrome icon will remain in the system tray or dock as long as background apps are running- even if all Chrome windows are closed. To close all background components, a user just needs to exit Chrome.
The feature is already available in Chrome’s Dev channel. For details on the API, check out our
developer’s guide
, which also includes sample apps to try out.
Posted by Andrew Wilson, Software Engineer and Michael Mahemoff, Developer Relations
Extending the Omnibox
Tuesday, February 22, 2011
One of the most powerful aspects of Google Chrome is the omnibox, also known as the address bar. You can type URLs and searches into one unified place and it all just works. With the new
omnibox API
, extension developers can make the omnibox even more powerful.
The omnibox API lets extension developers add their own keyword command to the omnibox. When the user types a query prefixed by this keyword, the extension can suggest potential completions and react to the user's input.
For example,
this extension
lets you search and switch between your open tabs from the omnibox:
Keep an eye out for cool new extensions as developers get their hands on this API!
Posted by Matt Perry, Software Engineer
Native Client: Getting Ready for Takeoff
Friday, February 18, 2011
Over the last few months we have been hard at work getting
Native Client
ready to support the new
Pepper
plug-in interface. Native Client is an open source technology that allows you to build web applications that seamlessly and safely execute native compiled code inside the browser. Today, we’ve reached an important milestone in our efforts to make Native Client modules as portable and secure as JavaScript, by making available a first release of the revamped
Native Client SDK
.
The SDK now includes support for a comprehensive set of Pepper interfaces for compute, audio, and 2D Native Client modules. These interfaces are close to being stable, with some important exceptions that are listed in the
release notes
.
In addition, we’ve focused on improving security. We have enabled auto-update and an outer sandbox. This allowed us to remove the
expiration date
and localhost security restrictions we had adopted in previous research-focused releases. Beyond security, we’ve also improved the mechanism for fetching Native Client modules based on the instruction set architecture of the target machine, so developers don’t need to worry about this any more.
We are excited to see Native Client progressively evolve into a developer-ready technology. In the coming months we will be adding APIs for 3D graphics, local file storage, WebSockets, peer-to-peer networking, and more. We’ll also be working on Dynamic Shared Objects (DSOs), a feature that will eventually allow us to provide Application Binary Interface (ABI) stability.
Until the ABI becomes stable, Native Client will remain off by default. However, given the progress we’ve made, you can now sticky-enable Native Client in Chrome 10+ through the about:flags dialog. Otherwise, you can continue using a command line flag to enable Native Client when you want to.
A big goal of this release is to enable developers to start building Native Client modules for Chrome applications. Please watch this blog for updates and use our
discussion group
for questions, feedback, and to engage with the Native Client community.
Posted by Christian Stefansen, Product Manager
Chrome Web Store International Support: Developer Preview
Thursday, February 17, 2011
When we
recently announced
the availability of the Chrome Web Store to Chrome users in the US, we mentioned that we were hard at work making the store available globally. Today we’re excited to announce a preview release of the upload flow for several international markets as a step towards that goal.
Starting today, when you upload an app via the
developer dashboard
, you’ll have the option of selecting from the following sixteen countries to list your app: Argentina, Australia, Brazil, Canada, France, Germany, India, Italy, Japan, Mexico, Netherlands, Poland, Portugal, Spain, United Kingdom and the United States. If you are using
Chrome Web Store Payments
to charge for your app, you will also be able to set the app price for each country although if you’re not based in the United States you will not be able to complete your merchant account sign up just yet (this will be enabled soon).
Note that these apps will not yet be published to countries outside the United States. This will happen when the Chrome Web Store opens to consumers in these countries later this year. We are releasing this developer preview ahead of the consumer release so you have enough time to prepare your apps for international users.
We hope you can use this release to get familiar with the app upload process and take time to
localize your app listing
to make it accessible to more people. If you have additional questions, please take a look at
our FAQ
or join our
developer discussion group
.
Posted by Qian Huang, Software Engineer
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