If you, like me, have tried to install a Safari 5 extension such as Coda Notes, and were met with the following dialog:
and then spent 5 minutes looking through Safari’s Preferences window to no avail, this is how you enable Extensions on Safari 5:
- Open Preferences
- Click Advanced
- Click Show develop in menu bar
- Close and reopen Safari
- Click the Develop menu item
- Finally, click Enable Extensions
Viola.