User Agent: Mozilla/5.0 (Windows NT 10.0; rv:50.0) Gecko/20100101 Firefox/50.0 Build ID: 20161208153507 Steps to reproduce: 1.Long tapping on a bookmark (not the top page of the bookmark) ，in its context menu 'Open in New tab',click this item; 2.view the opened web page 3.back to bookmark tab 4.hope can continut to read the next bookmark item from the last one Actual results: 4.find the bookmark tab show its top page, not the position before I click the context menu 'Open in New tab' Expected results: 4.when back to bookmark tab, I hope the page stay at the last opsition, then I can read the next bookmark item (but now it will show the top page of bookmark tab).

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