Installing Safari Extensions
Once you have extensions downloaded to your computer what do you do with them? Well, they have to be installed, and installation is very simple.
Most extensions I have downloaded look like a littlea toy building block piece for the icon.
You double click that icon and if Safari is not open, it will open automatically. You will receive a prompt asking if you are sure you want to open the file extension.
Say yes. You will then receive another prompt in Safari asking if you want to install that extension. Say “Yes." The extension will be installed.
Some extensions will be activated immediately, while others might require you to restart Safari.
A small amount of extensions might not look like the toy piece. If might be the typical installer icon or be a custom icon. They also might require you to have Safari closed to install them.
I found an extension for an Amazon.com toolbar that ran like a normal installer application. Safari had to be closed, and I had to go through a typical installer process. When it was finished I could reopen Safari and the extension was installed.