Today, mobile arch-rivals Apple and Google have both released updates for their PC/Mac browsers, Safari and Chrome. Apple made available the 5.1.4 version of Safari for both Windows and Mac OS, while Google has served up the Chrome 18.0.1025.56 Beta for Windows, Mac OS and Linux.

The new Chrome Beta includes the following highlights:

- GPU acceleration of the Canvas 2D is now disabled by default and can be enabled in about:flags
- Disabled the image transport surface on Windows Vista and 7. For GPU accelerated content GPU process now renders directly to the window.
- Core Animation plugins no longer trigger GPU accelerated compositing on the Mac.

The Safari update brings goodies that:

- Improve responsiveness when typing into the search field after changing network configurations or with an intermittent network connection
- Improve JavaScript performance (on Mac OS Lion)
- Address an issue that could cause webpages to flash white when switching between Safari windows
- Address issues that prevented printing U.S. Postal Service shipping labels and embedded PDFs
- Preserve links in PDFs saved from webpages
- Fix an issue that could make Flash content appear incomplete after using gesture zooming (on Mac OS Lion)
- Fix an issue that could cause the screen to dim while watching HTML5 video
- Improve stability, compatibility and startup time when using extensions
- Allow cookies set during regular browsing to be available after using Private Browsing
- Fix an issue that could cause some data to be left behind after pressing the "Remove All Website Data" button

To download Chrome 18.0.1025.56 see this page. Safari 5.1.4 can be found here.