I've added a prototype intervention for this here: https://github.com/englehardt/indexeddb-blocking-fix. I've verified that this, combined with the partitionedHosts pref change still fixes the breakage from Comment 0 and Comment 5. Dennis: is it possible to ship this intervention in the webcompat addon?
Bug 1631811 Comment 9 Edit History
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I've added a prototype intervention for this here: https://github.com/englehardt/webcompat-interventions/tree/master/bug_1631811. I've verified that this, combined with the partitionedHosts pref change still fixes the breakage from Comment 0 and Comment 5. Dennis: is it possible to ship this intervention in the webcompat addon?