I just saw KaiRo's XULRunner Wishlist and I want to point out that he has some really really valid points and I share many of his wishes. Perhaps I can help somehow with Bug #68702 (Pipe-based IPC). I'm actually really disappointed to learn that this doesn't already work, stdio is such a, well, standard thing, I assumed it would already be working. This will be a huge obstacle which may prevent me from using XULRunner for a major project that I am working on. Hopefully I can help fix that bug or otherwise work around the issue. Anyway if you are concerned about XULRunner and you didn't yet read KaiRo's post, go check it out ..... Update:I have started compiling the various wishlists into a single list on the MozPad wiki.