The vast majority of the time, installing Safari extensions like AdBlock is a two- or three-click process. Safari extensions can be uncooperative sometimes, however. If you encounter an error when trying to install AdBlock, first try these suggestions. If they don't fix the problem, try this idea for how to install Safari extensions when it’s being difficult.
Note: This article applied to Safari 9. We don't know if Safari 10 extensions have the same issue.
Safari 9 had a bug (or overactive protecting scheme, who knows) that could make it a real challenge to install AdBlock or any extension, and in particular extensions not downloaded from the Safari extension gallery. Our user found the following solution in the Apple forum on Stack Exchange:
- Download and unpack the extension installation file (.safariextz). For instance, you can get AdBlock's installation file from the AdBlock code repository, http://code.getadblock.com/releases/.
- Go to System Preferences > Keyboard > Shortcuts > Keyboard (OS X 10.11.4+) or System Preferences > Keyboard > Shortcuts > Full Keyboard Access (OS X 10.11.1 to 10.11.3).
- At the bottom of that dialog box, change the Full Keyboard Access option from Text boxes and lists only to All controls.
- Dismiss the System Preferences window.
- Return to installing the extension. Double-click the Safari Extension file, and when the "Are you sure you want to install..." dialog box appears, do not click the Trust button. Instead, use the Tab key to select the Trust button and then press the space bar to confirm.
Bonus tip: Drag and Drop
You can also install Safari extensions manually by dragging their installation file on top of the Safari icon in the Dock.