Re: [slightlyoff/ServiceWorker] consider allowing multiple worker thread instances for a single registration (#756)

It's slow polling, every 5 minutes, so shouldn't be a performance worry

> don't assume it'll be slow until you see it for yourself

It's not just slowness I worry about, it's the amount of processing needed. Trying to be kind to the device's CPU by holding a fairly small object in memory and reading from the DB every 5 minutes. The downside - that the flags may be up to 5 minutes out of date - is something I can live with. I may do some experiments to test out the perf of reading from IDB each time though. So far it's just a quick fix to deal with the fact that multiple SW threads can exist in firefox, which was news to me.

> do your flags often change during the life of a service worker

Typically they'll change very infrequently, but if e.g. a page that's been open in a tab for ages is controlled by one SW instance, and another page is opened in another tab which spins up a new instance of the SW, and this page load comes with an update to the flags, then I'd want the update to propagate to the first SW instance. 

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