What's hapenning at the platform level is, with bug 1554302 applied, we are getting a call to [`nsIDOMWindowUtils.setRestoreResolution()`](https://searchfox.org/mozilla-central/rev/61f224ec08ddc6f9a93ac45c8c3c5f7159be7c2a/dom/interfaces/base/nsIDOMWindowUtils.idl#245), with the resolution being `3.0`, which we do not get without the patch. This overrides the paltform's internal calculation of what the resolution should be (which would otherwise be something like ~0.7, depending on the screen size) and results in the zoomed-in rendering.
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What's hapenning at the platform level is, with bug 1554302 applied, we are getting a call to [`nsIDOMWindowUtils.setRestoreResolution()`](https://searchfox.org/mozilla-central/rev/61f224ec08ddc6f9a93ac45c8c3c5f7159be7c2a/dom/interfaces/base/nsIDOMWindowUtils.idl#245), with the resolution being `3.0`, which we do not get without the patch. This overrides the platform's internal calculation of what the resolution should be (which would otherwise be something like ~0.7, depending on the screen size) and results in the zoomed-in rendering.