I can confirm this bug too. browser.cookies.getAll function is not working in Safari from v 18. it only works if developer tools console is opened.
nemanja_readcube
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
Post
Replies
Boosts
Views
Activity
Hi! Any news on this? I'm having the same problem as OP, and I also tried latest Safari Technology Preview and error still persists there? Any workaround for this or is it going to be fixed in Safari soon?