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Windows Task Bar Will Not Pop Up In Firefox Window

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I have my Windows Task Bar set to collapse when the mouse is not over it. When I first open the Firefox browser, I cannot get my Windows Task Bar to pop up when I hover my mouse over the bottom of the screen.

If I reduce the size of the Firefox window and then expand it back to full size the Task Bar will again operate normally by popping up when I hover the mouse over the bottom of the screen and then collapsing again when I move away.

This didn't start happening until after the last couple of updates.

I have my Windows Task Bar set to collapse when the mouse is not over it. When I first open the Firefox browser, I cannot get my Windows Task Bar to pop up when I hover my mouse over the bottom of the screen. If I reduce the size of the Firefox window and then expand it back to full size the Task Bar will again operate normally by popping up when I hover the mouse over the bottom of the screen and then collapsing again when I move away. This didn't start happening until after the last couple of updates.

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