Firefox doesn't work in Windows 10, but I don't have Trusteer Rapport as suggested in Forum.
When I click on Firefox icon, it opens. When I attempt to enter a url, it presents "Well, this is embarrassing" error message and becomes nonresponsive. I have attempted both "restore" and "close" but get the same frozen screen on reopening. Your forum suggests that the problem is Trusteer Rapport. To my knowledge, I do not have Rapport (have never heard of it and it does not show up on my list of apps). I also tried downloading latest version but also got the same result. Firefox used to be my default browser (Win 8.1 and earlier).
Following advice on forum, I looked at crash reports and found this single ID in the period after I upgraded to Win10: bp-9f2cbb58-8637-4cce-b84c-4e2322150826
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Product Firefox Version 40.0.2
Release Channel release OS Windows NT OS Version 10.0.10240
The crash report flagged these programs;
Signature shutdownhang
Nvwgf2um.dll = NVIDIA Compatible D3D10 Driver = NVIDIA Corporation
New Update; Flash Player Version 19.0.0.226
https://www.adobe.com/products/flashplayer/distribution3.html
Note: Windows users must download the “Internet Explorer”
and “Plugin-based browsers” installers.
Note: Edge on Win10 does not use ActiveX version but its own Flash.
See if there are updates for your graphics drivers https://support.mozilla.org/kb/upgrade-graphics-drivers-use-hardware-acceleration