As mentioned on IRC, it's Synced Tabs, not Reading List that's missing in the screenshot.
This is not part of the new tablet UI. I nom'd this bug to get discussion going.
No longer blocks: 1014156
tracking-fennec: --- → ?
In another bug I raised the suggestion that we could use an expanding floating action button to display a list of additional screens. I believe the suggestion at the time was to paper of the cracks by making the header scrollable.
Or go a quick return drop down like what Google+ has.
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