[Gecko Bug 1497007] Change transaction in different scope to a readonly transaction. #21160
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Firefox doesn't allow running readwrite transactions in parallel, even with a
different scope. For the purpose of this particular test, it shouldn't matter
if it is a readwrite or readonly transaction.
Differential Revision: https://phabricator.services.mozilla.com/D55672
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1497007
gecko-commit: 787c340dd3d0e2b20c8302bd6c66f0e15ae09edc
gecko-integration-branch: autoland
gecko-reviewers: dom-workers-and-storage-reviewers, asuth, janv