Never mind -- the talk that just started speaks directly to this and says Safari Web Extensions are separate from Safari App Extensions and will not require the macOS app wrapper.
leggett
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Ok, I take that back. Apple DOES still require the macOS app wrapper... but there is a new tool to do this (in Xcode) for us that you should only have to run once.
UPDATE: I ended up filing a bug Apple via the Feedback Assistant and they eventually fixed the bug (in Jan 2022). This now works as expected: the content script can listen for changes to storage on an options page with browser.storage.onChanged.
I posted a question and had an Apple employee reply and ask for more information. But I can't reply or comment on the post to provide that info. I've tried signing into another account and had the same problem. Here is the post: https://developer.apple.com/forums/thread/706346
I filed a bug report in July 2022 and it hasn't been responded to. The feedback ID is FB10544296
P.S. This post was locked when the wwdc21-10131 tag was applied which disabled my ability to reply, comment, or update the post.
Update after some more testing.
Good news: I CAN now block images in Gmail.
Bad news: I CAN NOT block images based on anything in the path after a "#" in Safari (where as I can in other browsers)
So if this is the url for the image I want to block:
https://ci3.googleusercontent.com/proxy/gHU4xG2VeSnDGYzSz5X#https://news.us13.list-manage.com/track/open.php?id=123
This rule WILL work:
{
"id": 1,
"priority": 1,
"action": { "type": "block" },
"condition": {"regexFilter": "gHU4xG2VeSnDGYzSz5X", "resourceTypes": [ "image" ] }
},
This rule will NOT work:
{
"id": 1,
"priority": 1,
"action": { "type": "block" },
"condition": {"regexFilter": "track", "resourceTypes": [ "image" ] }
},
THIS POST IS A DUPLICATE AND CAN BE DELETED (the original post was unlocked and I was finally able to reply to it).
Furthermore, this issue is somewhat fixed (I can get them to work in Gmail) but I found a new issue: DNR doesn't match against anything in the location.hash on a URL. More details in the original post: https://developer.apple.com/forums/thread/706346