Google yesterday released Chrome 25, patching 22 vulnerabilitiesand debuting a new security feature that blocks silent installations of add-ons.
The latter is Chrome 25's most noticeable change to users. It automatically disables third-party add-ons that are installed on the sly by other software. Add-ons -- Google calls them "extensions" -- that were previously installed by third-party software will also be barred from running.
Users can approve a silent-installed extension by clicking a button in the dialog box that appears when Chrome blocks the add-on.
Google's move follows a similar one made by Mozilla more than a year ago, when it, too, crippled silently-installed add-ons. In November 2011, Mozilla debuted Firefox 8, which automatically blocked browser add-ons installed by other software.
Although silent add-ons have historically been more of a problem for Firefox than for Chrome, Google has been limiting add-ons since July 2012, when Chrome 21 began blocking add-ons hosted on a third-party website. Since then, only add-ons obtained from the Chrome Web Store, Google's official distribution mart, have been allowed.
Website designers can, however, trigger an add-on install from their URL using what Google dubbed "inline installation." The actual add-on, however, is still hosted on the Chrome Web Store.
Silent add-on installation has been possible only on Windows; OS X and Linux do not offer slippery websites a way to sneak an add-on into a browser.
The new version also adds the Web Speech API (application programming interface) that lets website and Web app developers add speech recognition features in their creations. Web Speech API is based on JavaScript, one of the Internet's foundational scripting languages.
Google has created a dictation demonstration of the Web Speech API that users can try out with Chrome 25.
Chrome 25 also patched 22 vulnerabilities, two fewer than January's Chrome 24. Google labeled nine of the flaws as "high," the company's second-most-serious threat rating, eight as "medium," and five as "low."
The patches prepare Chrome for the Pwn2Own hacking contest, which will kick off March 6 at the CanSecWest security conference in Vancouver, British Columbia. Unlike last year, Google has contributed money to the prize pool of Pwn2Own, which will reward $100,000 to the first researcher to hack Chrome on Windows 7.
