>>> My Info: Win7_64, Nightly 49, 32bit, ID 20160526082509 STR_1: 1. Open this url in a new tab: data:text/html,<script>setTimeout("location='data:,a'",100)</script> 2. Hover mouse over Back button in urlbar 3. Hold left mouse button, then press Alt+Tab before tab history appears AR: Another application becomes focused. Tab history from Firefox appears above that application ER: Tab history shouldn't show up
Reproducible with the following specs: Mozilla/5.0 (Windows NT 6.1; rv:54.0) Gecko/20100101 Firefox/54.0 Pre-req before Step 1 should be that another application is used. In this case, I used WordPad.
Component: Untriaged → Tabbed Browser
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