How To Install Safari 5 ExtensionsJune 9th, 2010
Safari 5 comes with extensions support but it appears to be a developer feature at the moment. It is not at all apparent how to enable extensions or install extensions.
Before you can manage Safari 5 Extensions, you need to enable it. But first you need to enable the developer menu. Open Safari 5 Preferences and select the “Advanced Tab”. Tick the checkbox “Show Developer menu in menu bar” at the bottom.
Close Safari 5 Preferences and you get a new Developer menu. Select “Enable Extensions” from the Developer menu.
When you open Safari 5 Preferences you should see a new Extensions tab that allows you to manage installed Extensions. The following picture shows two installed extensions. See section follows on how to install extensions.
Safari Extension Gallery will only open this summer but there are several extensions already available. You can search the web for Safari extensions or visit this Safari Extensions Tumblog that will tide you over until Apple opens the official gallery.
To install an extension, simply download the extension and open the extension file ends with safariextz. A prompt will appear asking you to confirm the installation.