Apple is introducing a lot of changes with MacOS Mojave and Safari 12. Some of them mean that how you use AdBlock will change after you upgrade. Whether AdBlock will stop working altogether depends on where you installed it from.

I installed AdBlock from your website

The AdBlock extension will stop working when you upgrade to Safari 12. That's because Safari 12 no longer supports "self-hosted" extensions (.safariextz-style extensions downloaded from a developer's website). To continue using the AdBlock extension, you will need to install it from the Safari Extensions Gallery.

I installed AdBlock from the Safari Extensions Gallery

You don't need to do anything right now. The AdBlock extension will continue to work for a while, whether you upgrade to Safari 12 or not.

Sometime next year Apple will retire the Safari Extensions Gallery. When that happens, you may have a choice of options:

  • If you have upgraded to Safari 12 by then, you will need to install the AdBlock app from the Mac App Store.
  • If you're still using Safari 10 or 11, you can either install the AdBlock app from the Mac App Store or install the self-hosted extension.
  • If you're still using Safari 9 or earlier, you will need to install the self-hosted extension.

I don't remember where I installed AdBlock from

If you don't specifically remember installing AdBlock from our website, you probably installed it from the Safari Extensions Gallery. That's the most common way to install Safari extensions.

How do I install the self-hosted version of AdBlock?

If your Mac is running OSX 10.11 (El Capitan) or earlier:

  1. Visit and click INSTALL FOR SAFARI.
  2. Open your Downloads folder and click AdBlockSelfHosted.safariextz.
  3. Click Install from Developer.

If your Mac is running MacOS 10.12 (Sierra) or 10.13 (High Sierra):

  1. Download
  2. Open your Downloads folder, open the file, and select Trust.

If your Mac is running MacOS 10.14 (Mojave) and Safari 12, you cannot install the self-hosted extension.

What happens if I don't do anything?

AdBlock could stop working. With Safari 12, Apple is making three changes to Safari extensions that directly affect AdBlock users:

  • Legacy (.safariextz-style) extensions distributed through the Safari Extensions Gallery are going away at the end of December.
  • Apple will no longer allow users to install extensions from a developer's website.
  • Traditional ad blocking extensions are being replaced with content blocking extensions.

What that means is that after you upgrade to Safari 12, you may have until the end of this year to switch to the new AdBlock app.

However, if you installed AdBlock from our website, you must switch before you upgrade. If you don't, AdBlock will be disabled the first time you launch Safari 12.

Is the AdBlock extension going away?

We plan to keep supporting the legacy extension for the foreseeable future for people using Safari 11 and earlier.

Please note that we may decide to stop adding new features to the extension at some point. If we do, we will notify you so that you can switch to the AdBlock app if you like. (You may need to update to the latest version of Safari first.)

Why is Apple eliminating browser extensions?

According to Apple, Safari app extensions bundled with Mac applications are faster, lighter on your Mac's memory and performance, and more secure than the old .safariextz-style extensions.