Google yesterday released Chrome 25, patching 22 vulnerabilities and 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.
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."
Five of the vulnerabilities were reported to Google by three outside researchers, who received $3,500 for their work. So far this year, Google has paid out $10,500 from its bug bounty program.