Nick Alexander 9ae4c9ba03 Bug 1120863 - Do not process updates when launching devtools. r=mhowell,ochameau
This implements the simple approach advocated for in
https://bugzilla.mozilla.org/show_bug.cgi?id=1120863#c26.

It's not easy to lift the duplicated chrome document URL to a shared
location, so we instead annotate both locations.

I've provided an environment variable that will allow a process that did
not itself process updates to witness that fact and used it to add a test.

Differential Revision: https://phabricator.services.mozilla.com/D106993
2021-03-04 03:39:43 +00:00
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