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Deprecated

Safari extensions refers to the legacy .safariextz-style Safari extensions. Developer-signed Safari extensions are not supported in Safari 12. Safari extensions distributed in the Safari Extension Gallery are deprecated, and Safari 12 is the last release to support them. New submissions to the Safari Extensions Gallery will be accepted until the end of 2018.

Safari 12 by default will turn off Safari extensions using canLoad. Instead of using canLoad, use Content Blocker extensions.

Safari App Extension

It will be impossible to recreate JS Blocker to work as a Safari App Extension as the necessary features are no longer supported as of Safari 12 and Safari Technology Preview 58.

Updates

Users who downloaded JS Blocker from the extensions gallery will not be able to updae beyond 5.2.2. Apple is not responding to my requests for updates despite them saying they will accept submissions until the end of 2018.