When I open firefox browser my firefox taskbar icon shows 3 tabs open but firefox browser itself only shows 2.
PC OS is Windows 10 Firefox Browser Version 50 When I click on the blank tab in the taskbar the blank tab opens but will never list in the menu bar. Wouldn't be able to access that tab otherwise.
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It might be that's in a separate window.
Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox.
A small dialog should appear. Click Start In Safe Mode (not Refresh).
Is the problem still there?