WYSIWYG-editor and Firefox

Firefox seems to have a problem with the WYSIWYG-Editor. The text manipulation tools are not working at all and the others like Insert hyperlink just produde [undefinded=undefinded].
IE9 is working fine.

Firefox 18.0.1 on Win7 x64

Yup, JavaScript is inserting:

[undefined=undefined]

[color=gray]FF 20.0 on: MSI Z68A-G45 - Intel i5-2400 - DDR3 2x2GB 1600MHz - GeForce GTS450 Palit - WD 1TB 64MB SATA - Win7 Pro/64 SP1 / Raring Xfce AMD64[/color]

Which editor?

The “what you see is what you get”-editor for posting in this forum.

Hasn’t changed with Firefox 20.0.1