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ESR 68 File/Save Dialog Box Hangs Firefox

I posted this on the MozillaZine forum, and while it only seems to happen with Firefox ESR v68, there could be something Windows-related that I'm missing. In which case, I thought I'd share my issue with you all.

I'm running Firefox ESR 68.2.0 x64 using Windows 8 x64. This issue has happened ever since moving to v68. It happens with no other applications on Windows, nor did it happen on ESR 60.

I proceed to save a file, and I'm going to perform one of two tasks before doing so:
(a) create a new folder for my download
(b) alter the "view" setting to list in the Download File/Save box.

So I click the download link, and the File/Save Box loads. As soon as I press "New Folder", or try to right-click to bring up "view" settings, Firefox freezes (typically for about two minutes). Eventually Firefox comes out of it's slumber and I may proceed to make the new folder, and finish my download. Next time I try the same thing, it freezes again.
If I go to my Event Log in Windows, there is an Event ID 10010 and a DCOM timeout error for {3EEF301F-B596-4C0B-BD92-013BEAFCE793}, which I have since learned is the Desktop Undo Manager. Now I've tried a new profile, reinstalling Firefox ESR, and turning on or off Hardware Acceleration - no difference.

**** One interesting thing of note ****
After awhile, I found that the problems went away if I tried changing a Hardware Acceleration setting on or off, or by changing profiles. But as soon as I log off Windows or restart Windows, the problem returns again. Any help is appreciated. Let me know if I can provide any more information.

My Computer

System One

  • OS
    Windows 8 Pro x64
    Computer type
    System Manufacturer/Model
    HP xw8600 Workstation
    Two Intel Xeon Core2 Quad 3.2 GHz Processors
    16 GB DDR2 800 MHz
    Graphics Card(s)
    nVidia Quadro FX 3800 PCI-E
    Sound Card
    Realtek HD Audio
    Monitor(s) Displays
    Samsung SyncMaster 213T 21" 4x3 Flat Screen
    Screen Resolution
    Hard Drives
    Two Seagate Cheetah 300 GB SAS Disks
    HP xw8600 Workstation Case
    Two CPU Fans and a Larger Case Fan
    PS/2 Keyboard
    Microsoft USB Optical Mouse
    Internet Speed
    7 mbps
    Firefox Quantum ESR 68.0.1
    Windows Defender
    Other Info
    Two LSI 3000 SAS Adapters

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