Actually it wasn't. Disable with immediate reenable should keep the default. We have code that explicitly handled that. https://searchfox.org/mozilla-central/source/browser/components/extensions/parent/ext-chrome-settings-overrides.js#381
Bug 1638888 Comment 2 Edit History
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Actually it wasn't. Disable with immediate reenable should keep the default. We have code that explicitly handled that. https://searchfox.org/mozilla-central/rev/9193635dca8cfdcb68f114306194ffc860456044/browser/components/extensions/parent/ext-chrome-settings-overrides.js#381