Copy from Firefox in a ICA session

[itguy]

I'm using SandboxIE (v.4.16) on a Win7 Pro SP1 XenDesktop machine. Firefox and IE is running with SandboxIE.
It is essential for me to copy and paste between the Citrix ICA session and the local desktop. However copy and paste between this two systems works perfectly except for Firefox. It is possible to paste something into Firefox but copying an URL out of Firefox to the local desktop is not working. I already tried some different applications like IE, notepad++ and Adobe Reader. Everything works fine.

I'm using Firefox 24.4.0 ESR (also tried the newest version already).

Thanks for helping!