A sample extension can be found here: https://static.jeurissen.co/9612454-apple-sandbox-issue.zip In Chrome and Firefox, "loading..." changes to "loaded". Not in safari due to this issue. The script simply doesn't load.

The manifest of said sample extension: manifest.json

A sample extension is available in the feedback assist ticket and with this URL: https://static.jeurissen.co/8986072-apple-frame-issue.zip In browsers like Firefox and Chrome. The frame is loaded and says "frame". In Safari it doesn't load and thus is blank.

Can this post be marked as "not solved". As the issue isn't solved yet.

You're welcome. Please let me know if you need any more info. Thanks

Sample extension can be found in the feedback assistant or using this link: https://static.jeurissen.co/9612492-apple-darkmode-issue.zip In Chrome and Firefox, in dark mode the extension colors green. Yet in Safari it is blue. Basically it doesn't recognise the dark mode media query.

See feedback assistant report: https://feedbackassistant.apple.com/feedback/9633205 This report also includes a video and sample extension.

A sample extension can be found here: https://github.com/carlosjeurissen/webext-tech-demo-extensions/tree/main/issues/safari-9723963-merged-sync-and-local-storage And the feedback assistant report can be found here: https://feedbackassistant.apple.com/feedback/9723963

Same issue in Xcode 16.3 release 16E140

It happens both on new and existing projects. Extensions load fine in the iOS simulator 18.3 even on Xcode 16.3. So the issue seems to be specifically related to iOS 18.4.

Can not reproduce this in Safari 18.4. Is this still an issue? Did other extension APIs other than the webNavigation API return tabId of 0 instead of -1?