Andrew Swan efbc1f62aa Bug 1467136 Ensure extension messaging cannot miss the startup event r=kmag
When a background page has a messaging listener but the background page
is started in response to something other than an extension message, we
were missing the background "startup" event.  Fix that by setting up the
listener earlier.

MozReview-Commit-ID: Cr58EyCoY6W

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extra : rebase_source : 0d309e01be35e2ef7ab5e489726d0191571ca371
2018-06-06 13:58:43 -07:00
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