It's not fixed in 17.6.1 or 18.
alexkates
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Dropping a link to a StackOverflow i authored around this exact topic. I've been trying to figure this out for months as well.
https://stackoverflow.com/questions/78570837/safari-web-extension-background-script-becomes-unresponsive-after-30-seconds
I'm almost certainly experiencing a similar issue that I've documented with a minimum-reproducible example that you can find in this forum post.
Some additional findings...
If you look through the content script code you'll see that I am calling runtime.sendMessage every 1 second which always causes the background script to crash after 30 seconds.
I started to play with the 1 second interval to see if it behaved differently. Increasing it to 2 seconds caused a crash after 15 calls (also 30 seconds). Increasing the interval to 3 seconds caused a crash after 10 calls (also 30 seconds).
Increasing to 4 seconds causes the background script to behave how I'd expect... that is it never crashes and is able to respond to the sendMessage request forever.
Same exact issue. Were you ever able to solve this?