If the layout returns with a delay and the client has a layout cache, the client uses the cache, then when the delayed layout returns, it updates any open tabs. We should probably not use the cache if the pref has changed and we're waiting for a response to succeed/fail.
Bug 1529035 Comment 0 Edit History
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If the layout returns with a delay and the client has a layout cache, the client uses the cache, then when the delayed layout returns, it updates any open tabs. We should probably not use the cache if the pref has changed and we're waiting for a response to succeed/fail. If it fails, we can then use cache.