Multiple Serviceworkers in Isolated Tabs #199
Description
Testing with Firefox 62 it appears that instead of a single service worker process shared among all tabs (per domain) there is now a service worker proccess per tab (per domain). Loading new pages within a single tab still keep the same service worker, but openning a new tab spawns a new service worker.
I believe this change still complies with the service worker spec, which defines service workers as stateless, but has broken our model of how we use service workers because of a few hacks we have made to keep the serviceworker performant. This will require some changes to how I had originally mapped out multi tab support, but should still be doable.
I do still need to test on chrome. If the firefox and chrome implementations of service workers has diverged (which I would guess they have) we'll have to consider that as well.