:petru, the toolbar is not dynamic on PDF files, however the "Scroll to hide toolbar" option was toggled ON. In what concerns the toolbar position, the issue is reproducible regardless of the "Top" or "Bottom" placement.
Bug 1817810 Comment 2 Edit History
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:petru, the toolbar is not dynamic on PDF files, however the "Scroll to hide toolbar" option was toggled ON. In what concerns the toolbar position, the issue is reproducible regardless of the "Top" or "Bottom" placement. Re-tested this with the "Scroll to hide toolbar" option toggled OFF, and the empty space intended for the toolbar is no longer displayed. I'll update the STR with this info. Thanks!