Safari - the third party extensions installation is not possible

Hello community,

Since the update to Mac OS X El Capitan 10.11.3 I am unable to install Safari extensions from third parties (like Agilebits 1Password or ublock).

I can double click on the extension and the weather of dialogue I trust the source appears (it's in German).

But regardless of this choice, I do the extension ist not installed.

My system is

  • iMac (retina 5K, 27 inches, end of 2014) - 4 GHz Intel Core i7, 32 GB 1600 MHz DDR3, 3 TB Fusion AMD Radeon R9 M295X 4096 MB drive
  • Safari 9.0.3 (since the update of 10.11.3 combo)

I tried to

  • Restart the iMac
  • Install the 1Password file - 4.5.2.safariextz from different places
  • Remove extended attributes and ACLs to the file downloaded 1Password - 4.5.2.safariextz
  • uninstall all extensions and empty folder ~/Library/Safari/Extensions
  • install the extensions via the Terminal (Open ~/Downloads/1Password-4.5.2.safariextz or sudo Open ~ / Downloads/1Password-4.5.2.safariextz)
  • copy the 4.5.2.safariextz - 1Password directly at ~/Library/Safari/Extensions
  • Re-download the 1Password - 4.5.2.safariextz from somewhere else

Also, Google showed no relevant problem my problem solutions.

Currently, I am only able to install the extension directly from the Apple Extensions Gallery.

The problem is that an extension of the Apple Extensions Gallery 1Password is obsolete and does not work properly with 1Password 6.0.1 (problems on amazon.com and other sites). Also not available in the Apple Extensions Gallery ublock.

Has anyone else had similar problems and could solve them?

Best regards

Gerhard

I got a solution.

A reboot in safe mode did the trick.

The internal caches of Mac OS X, most likely to rebuild...

Tags: Mac OS & System Software

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