Chrome Update Adds Omnibox Prerendering and Scanning Protection

Martin Brinkmann
Feb 8, 2012
Updated • Feb 8, 2012
Google Chrome

Google has just released an update for the Chrome browser's stable branch that fixes several security vulnerabilities and adds several new features to the browser. The two most prominent feature additions in Chrome 17 are Omnibox Prerendering and Download Scanning.

Omnibox Prerendering basically preloads some of the pages that are presented to you in the browser's address bar. This reduces the time between hitting the Enter key on the keyboard and seeing the page fully rendered in the browser window. It is not clear how Chrome selects those pages, but it is likely that your previous browsing history and bookmarks may have something to do with it. This does create some overhead though, especially if the browser does not select the right pages that often.

Chrome users who do not want or need the prerendering feature can disable it in the following way:

  • Open chrome://flags/ in the Chrome address bar and hit enter.
  • Locate the flag Prerender from omnibox and change the feature's state to disabled.
  • prerender from omnibox

    The second new feature is the automatic scanning of executable files like exe or msi in Chrome to warn you if you are downloading a malicious file or a file from a host that is know to host a high percentage of malicious downloads.

    Google maintains a whitelist of files that are not checked. All other files are checked with Google to retrieve more information. While not a fail safe approach, it can warn users if they are about to download known malicious files. The concept looks similar to Microsoft's SmartScreen Filter. It does not seem possible to disable the feature right now in the browser.

    In addition, a total of 20 security vulnerabilities were closed in Chrome 17 of which one received the highest possible severity rating of critical.

    You can read up on the changes at the official Chrome Release blog. Chrome updates should already been applied to existing Chrome Stable installations. You can verify the version with a click on Wrench > About Google Chrome. There you can also download and apply the update if the browser has not been updated yet.


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  1. ilev said on February 10, 2012 at 10:13 am

    And the new beta version 18.0.1025.11 beta-m adds hardware acceleration even to old XP PCs.

    1. Martin Brinkmann said on February 10, 2012 at 11:09 am

      Thanks Ilev.

  2. Tim said on February 9, 2012 at 2:28 am

    I hate this change, now when I hit enter after typing some terms in omnibox,
    it opens just with the terms in a input field, with no results showing.
    setting the prerender to disabled, just switches right back to automatic,
    I disabled instant in prefs now.

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