Since bug 1165981 has landed, official 41+ x64 editions only recognize Flash plugin, which may cause some inconvenience for people who want to use other plugins such as FireIE, Siverlight, PDF Plugins and etc.
Custom build edition may back out bug 1165981 patches to remove the plugin restriction, but how official x64 edition users do?
I wrote a tool which can meet the needs some days earlier, which can be downloaded in https://sourceforge.net/projects/pcxfirefox/files/Tools/RemoveFx41x64PluginRestrict/
The tool will patch official x64 edition’s xul.dll. I tested it successfully in Fx41 x64, Fx42 x64, Fx43 x64, and I think as long as bug 1165981 related patches don’t change so much, the tool can work in any Fx41+ x64 windows official edition.
ps: The tool was generated by a patch tool using GBK, so there may be garbled in some OS, but didn’t influence the tool’s function. And I don’t guarantee whether the tool has some risk to your computer, because I only test it in my environment.