If you tell Chrome to block JavaScript on all sites by default, when you browse to a site that uses JavaScript, the upper right corner of the browser displays a box with a red “X” through it.

If you tell Chrome to block JavaScript on all sites by default, when you browse to a site that uses JavaScript, the upper right corner of the browser displays a box with a red “X” through it.

The aim is to block third-party scripts that use "browser re-identification" tricks to extract info about your browser and device.

Beginning this summer, Google will cap the resources a display ad can use in Chrome in order to protect users’ batteries and data plans.