Also saw similar issues where background script becomes unresponsive and can't even input any expressions. While debugging, script will become responsive again only after close/reopen of background script debugger.
Curious if you're using sendNativeMessage()? For me, some changes to that method (or removing it) fixed my particular flow and bg script stopped becoming unresponsive.
webextensions
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luxu/swaminathanv, did you guys ever find working solution? I'm now trying on manifest 3 and trying this approach with host_permissions without success.