The confusion seems to be an AFP story conflating two separate programs. The AFP story mentions Mozilla at the same time as an organization called Full Fact, that has a product that does automated live fact checking. It was initially designed for use during televised political debates, where it could show "correct" and "incorrect" warning popups on screen in real time according to what was said:

https://phys.org/news/2017-08-mozilla-fact-checker-fake-news...

(Apologies for the awful link source, I can't find a primary AFP link. Several other sites that have published the same identical story.)

Full Fact does appear to be a real organization, they claim to already work with the BBC, Guardian & other media partners, as well as Google. Some of the controversy seems to be over their grant funding from Omidyar Network and an organization founded by George Soros. (Whether that's a reason for concern, I have no idea.)

https://fullfact.org/blog/2017/jun/automated-fact-checking-f...

https://fullfact.org/blog/2017/jun/awarded-500000-omidyar-ne...

https://www.theguardian.com/technology/2017/aug/08/fake-news...

I assume OP is talking about this http://www.bbc.co.uk/news/technology-42065644

Edit: Misread, thought OP was talking about Google not Mozilla.

definite [citation needed] on that one