Leg extensions are one of the most effective exercises for isolating the quadriceps. Unlike compound movements like squats or ...

Extension support adds useful extra features to the browsers that are unavailable by default. Mainstream browsers like Google Chrome, which dominates the market, do not support extensions on mobile.

With the release of Safari 5, Apple introduced a much-requested feature — extensions. Extensions are a better way to add those little missing features than the old and complex plug-in approach.