Why Opera isn’t planning to go open source

Suppose there was a software category so ubiquitous that virtually everyone used it and anyone could get the software for free. Suppose, also, that the software was highly standards-based, so much so that it did not require any patented or proprietary technologies to work. That software would be a perfect candidate for open source, right?

That description fits web browsers perfectly. And yet, despite seemingly having everything in its favour, Opera Software isn’t planning to open source its browser code.