On any page, using Ctrl+F or "Find in Page" menu option off the appbar hamburger menu slides up the orange Find bar, with a flashing caret indicating focus in the text field. If you start to type (soft or physical keyboard) the appbar and findbar slide away.
https://hg.mozilla.org/mozilla-central/rev/ed1a14f6ef85 (bug 895962) looks a likely culprit.
Status: NEW → RESOLVED
Last Resolved: 5 years ago
Resolution: --- → DUPLICATE
Duplicate of bug: 897941
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