Yury, this looks like something we should fix ASAP :(
I still see those messages when running e10s tests locally. Shouldn't that be fixed?
Yury, has your fix for this bug been merged from Shumway master to mozilla-central yet?
It shall be fixed by bug 1136470. I'll check that again.
Running `./mach mochitest-browser --e10s browser/components/sessionstore` does not produce any ShumwayBootstrapUtils related messages. Closing as WFM.