Many web veterans can share horror stories of friends and family who installed a few too many browser toolbars, some of them by accident. Google is clearly eager to avoid those disasters in Chrome -- it's instituting a new Chrome Web Store policy that will limit extensions to a single purpose. From now on, new extensions can't sneak in toolbars, secondary extensions or other features that aren't part of the core functionality. The move will create problems for honest developers who simply want to make rich add-ons, but Google is giving these code writers until June to either slim down or split up their current extensions. Although we doubt that everyone will like the stricter measures, they may be worthwhile if Chrome stays largely clutter-free.