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. Extensions have been available on Firefox and Chrome for a while and finally are available for Safari too.
However, Apple currently labels it as a developer feature, which needs to be enabled before extensions are available.
1. First of all, make sure you have Safari 5 downloaded and installed on your system. You can check this by clicking on the ‘Safari’ menu from menu bar and then choosing ‘About Safari‘.
7. To install an extension, just download it and double click the downloaded file, then ‘Install‘ from the pop-up window in Safari.
Apple hasn’t currently released it’s Extensions Gallery so to keep yourself updated about the latest extensions, check out http://safariextensions.tumblr.com/Related