Task bar doesn't display
The Task/Menu bar does not display. It is replaced by a white area. When your cursor is in this area you see information for the icons in the same location on the desktop.
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Separate Issue; Your System Details shows;
Installed Plug-ins
Shockwave Flash 20.0 r0
Shockwave Flash 13.0 r0
Shockwave Flash 11.3 r300
Having more than one version of a program may cause issues.
You must remove the older programs. Then get the current full installer.
Flash: Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac
Then reinstall the latest version.
Flash Player Version 20.0.0.267
https://www.adobe.com/products/flashplayer/distribution3.html
Note: Windows users should download the ‘’’active_x’’’ for “Internet Explorer,”
and the ‘’’plugin’’’ for “Plugin-based browsers” (like Firefox).
Note: Windows 8 and Windows 10 have built in flash players and Adobe will cause a conflict.
Adobe still offers Flash 18.0.0.268 as its extended support release further down
Start Firefox in Safe Mode {web Link} by holding down the <Shift>
(Mac=Options) key, and then starting Firefox. Is the problem still there?