Apple's bug reporting system Feedback Assistant is a black hole. I once filed a bug report against the bug reporter itself, requesting a public, searchable bug database, and here's what happened:
Much has changed. Yet nothing changed. Time is a flat circle.
For the sake of Safari extension developers everywhere, I've decided to post my Safari extension issues publicly on GitHub. Some of them are bug reports, and some are feature requests. Some are obvious, some incredibly obscure.
I encourage other Safari extension developers to post their issues too! You're welcome to use my issue tracker and post yours alongside mine. Or you can post yours somewhere else, but if you do, please let us know. If we share our issues like this, it can help improve the overall quality of the Safari extension ecosystem.
Take a look: Safari extension issues.