Firefox 50.1.0 + "Fire IE DLL not loaded" on WinXP home (SP3, 32bit)

[ifrh]

Pop-up Window with Errormessage "Fire IE DLL not loaded"
Fire IE DLL 1.4.6.2 (npfireie32.dll)

Information about Windows:
Microsoft Windows XP [Version 5.1.2600]
HOME, SP3, 32bit

Information about IE:
Version 8.0.6001.18702

Information about Firefox:
Name Firefox
Version 50.1.0
Build-ID 20161208153507
Update-Kanal release
User-Agent Mozilla/5.0 (Windows NT 5.1; rv:50.0) Gecko/20100101 Firefox/50.0
Betriebssystem Windows_NT 5.1

Activated PlugIns/Extensions
Adblock Plus 2.8.2 true
Application Update Service Helper 1.0 true
Fire IE 0.4.6.2 true
Firebug 2.0.18 true
Memory Restart 1.18.1-signed.1-signed true
More Tools Menu 1.2.4.1-signed.1-signed true
Multi-process staged rollout 1.5 true
NoScript 2.9.5.2 true
Pocket 1.0.5 true
Status-4-Evar 2016.10.11.01 true
Tab Memory Usage 0.2.7 true
TableTools2 1.17.1-signed.1-signed true
Tile Tabs 14.9 true
Web Compat 1.0 true

Deactivated PlugIns/Extensions
Free Download Manager extension 2.1.13 false
Microsoft .NET Framework Assistant 0.0.0 false
NetExport 0.9b7 false

[Construction]

Try about:config -> plugin.load_flash_only=false. It works on my Firefox 53.0 on Windows 10.