and rmottola upstream pushed lots of commits of front-end side, so 2 merge commit issued and new test build is uploaded: changelog from rmottola: - Bug 891360 - Move SessionStore I/O logic to a dedicated worker; r=yoric (c42ed07e6f) - Bug 893009 - Move _backupSessionFileOnce() logic into the SessionWorker; r=ttaubert (ddb0d2874b) - Bug 898184 - Restore telemetry measurements that were removed when transitioning to t
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