> So? Gecko was a mess and they had something actually exciting on their hand which was mostly untainted by their branding. They could have bet on it rather than chose to die a slow death while their money trickles to their highly pay executive team.

Mozilla/Firefox rose from the ashes of Netscape, which failed precisely because they tried to do a complete rewrite of their browser engine. With that in mind, it's not too surprising that they would want to backport features to Gecko.