Is the Firefox window maximized?
Did you try to resize the Firefox window?

You can also change the properties of the Windows Taskbar via the right-click context menu to either auto-hide or disable always on top.

Thanks Man.

Well I have auto-hide enabled but it is still covering the bottom of my web page. Very annoying as I cannot scroll far enough to see what it is covering.

Is the Firefox window too large or off to the bottom of the screen? Try resizing or repositioning the Firefox window. See Changes to toolbars and window sizes are not saved to restore the default window size/position and toolbar settings if you can't change the Firefox window or position, or if the changes to your Firefox window aren't saved when you next start Firefox.

If you need more help you should ask a new question in the support forum since this question was solved over a year ago and many Firefox support helpers don't look at solved questions. You can use this link as a starting point to ask a new question: https://support.mozilla.com/questions/new