(And the [commit that introduced our current behavior](https://hg.mozilla.org/integration/autoland/rev/290427746e6ed7447efebb743b795d169c459471) had something to the same effect in its extended commit message: "Create two pbmode prefs that will enable RFP/FPP **in PBMode only**". That implies that the intent here is that these `.pbmode` prefs only make a difference when you're in private browsing mode. Users probably won't read that documentation, but I think there's a natural assumption that this is how they work -- they only make a difference if/when you use private browsing mode.
Bug 1863853 Comment 6 Edit History
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(And the [commit that introduced our current behavior](https://hg.mozilla.org/integration/autoland/rev/290427746e6ed7447efebb743b795d169c459471) had something to the same effect in its extended commit message: "Create two pbmode prefs that will enable RFP/FPP **in PBMode only**". That implies that the intent here is that these `.pbmode` prefs only make a difference when you're in private browsing mode.) Users probably won't read that documentation, but I think there's a natural assumption that this is how these `.pbmode` prefs work -- they only make a difference if/when you use private browsing mode.