Bug 246622

Summary:	Local and Sync storage merged since safari 15
Product:	WebKit	Reporter:	Carlos J. <carlosj-webkit-bugzilla>
Component:	WebKit Extensions	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED FIXED
Severity:	Normal	CC:	ap, timothy
Priority:	P2	Keywords:	InRadar
Version:	Safari 15
Hardware:	Unspecified
OS:	Unspecified

Description Carlos J. 2022-10-17 05:04:16 PDT

Since Safari 15, the extensions local and sync storage seems to be merged into one. This means operations in local storage apply to sync storage and the reverse. This caused the users of of my extensions with more than half a million of downloads to loose all their user settings. To keep compatibility across browsers, the sync and local storage should be separated.

A sample extension can be found via this link:
https://github.com/carlosjeurissen/webext-tech-demo-extensions/tree/main/issues/safari-9723963-merged-sync-and-local-storage

Comment 1 Carlos J. 2022-10-17 05:04:34 PDT

Previously reported as:
https://feedbackassistant.apple.com/feedback/9723963
https://developer.apple.com/forums/thread/693211

Comment 2 Alexey Proskuryakov 2022-10-17 10:21:49 PDT

Thank you for the report! This is not a WebKit issue, but a Safari one. Apple will continue to track it internally.

rdar://84214292

Comment 3 Timothy Hatcher 2022-10-24 13:27:53 PDT

We are tracking bugs in Bugzilla for Web Extensions now as we move extensions support from Safari to WebKit.

But this was resolved in Safari 15.2. MDN has a note.

Comment 4 Carlos J. 2022-10-25 03:12:22 PDT

Thanks for fixing! Where is the note in MDN? Can't seem to find it.

Comment 5 Timothy Hatcher 2022-10-25 09:18:44 PDT

Click on "15" in the "Safari on iOS" column in the table at the bottom of https://developer.mozilla.org/en-US/docs/Mozilla/Add-ons/WebExtensions/API/storage/sync

"Safari 15 and 15.1 erroneously store sync items in the local storage area. If unable to locate sync items, check for sync items in the local storage area and do a one-time migration to the sync storage area."