Thanks, to be precise it's only the engine part of Foxit, the generator and renderer. The foxit itself is still pretty much proprietary software.

From the last 7 weeks commit history, I see only people associated with chromium. So may be foxit is not involved in developing pdfium anymore, or may be they're not developing in open and sync in once in a while.

https://pdfium.googlesource.com/pdfium/+log