The initial resize event is triggered from [ResizeReflowIgnoreOverride call in RefreshVisualViewportSize](https://hg.mozilla.org/mozilla-central/file/82134a2f7b89/layout/base/MobileViewportManager.cpp#l529) on the initial paint. Probably we don't need the resize event at that time. Also, in bug 1149555 unfortunately (accidentally?) we dropped (the check whether the size is changed)[https://hg.mozilla.org/mozilla-central/rev/b8174ee90b58#l3.102].
Bug 1528052 Comment 3 Edit History
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The initial resize event is triggered from [ResizeReflowIgnoreOverride call in RefreshVisualViewportSize](https://hg.mozilla.org/mozilla-central/file/82134a2f7b89/layout/base/MobileViewportManager.cpp#l529) on the initial paint. Probably we don't need the resize event at that time. Also, in bug 1149555 unfortunately (accidentally?) we dropped [the check whether the size is changed](https://hg.mozilla.org/mozilla-central/rev/b8174ee90b58#l3.102).