I should add (which I forgot, earlier) .. this isn't related to the process structure. At least for this case. For the Lars' possibly-related bug 1698473, I can't say. For this bug, I can reproduce it (show that wrong prefs are getting used, via debug printing) purely in the firefox "root" process. Although my minimal test case involves both a root process and one content process, debug printing showed the problem exists within the root process. So it must be a thread- structure thing, per comment 5.
Bug 1697560 Comment 7 Edit History
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I should add (which I forgot, earlier) .. this isn't related to the process structure. At least for this case. For Lars' possibly-related bug 1698473, I can't say. For this bug, I can reproduce it (show that wrong prefs are getting used, via debug printing) purely in the firefox "root" process. Although my minimal test case involves both a root process and one content process, debug printing showed the problem exists within the root process. So it must be a thread- structure thing, per comment 5.