I hate it when my Firefox saved window position is off-screen...
To fix: hit ctrl+N to create a new window, then keyboard back to the off-screen one (alt+tab on Windows, alt+~ on GNOME) and close it (ctrl+W or alt+F4)
@brion you can also alt+tab then windows+left/right arrow key to snap it back on screen
@brion (at least this worked in my old wacky Plasma setup)
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