Safari Technology Preview 32 [Solution: update to STP 33]
There is an issue in Safari Technology Preview (STP) 32 when installing extensions that do not come from the Safari Extension Gallery. When you reach the point of confirming you trust the extension clicking the Trust button will cause STP to crash. We've had reports of this happening with other extensions so it seems to be an issue specific to this build of STP rather than the extension itself.
The workaround for 1Password is to install from 1Password Safari Extension from Apple's Safari Extension Gallery. This will install the current stable version and bypasses the crash. For the moment it will not be possible to install our beta extension in STP 32 as there is not a way to publish betas to the gallery.
It is very likely STP 33 will see this resolve as I believe Apple have been informed :smile:
Update 16.06.2017
Safari Technology Preview 33 is now available and the issue seems to be resolved.