Developer to help upgrade an old XulRunner/XPCOM application?

I’m looking to hire someone with the expertise necessary to bring an old XulRunner/XPCOM application up to date with more recent Firefox versions than 5.6, the last version of FF that supported such applications. How can I find such a resource? Any pointers will be greatly appreciated.

Back in the day I have worked on quite a few complex applications built using XulRunner and if you are still on the lookout for someone, I would be help you out
You can reach me on
Cheers and Have a great day ahead,