https://www.cnet.com/news/htc-vive-headset-taps-into-firefox-reality-mozillas-vr-browser/

"By ensuring HTC devices have direct integration with a web browser, we make it easier for those creators and users," Mozilla said Monday in a statement. Vive users can still use other browsers and change the default if they want. Mozilla declined to disclose terms of the partnership.

Firefox once was second only to Microsoft's Internet Explorer in terms of web usage, helping promote the idea that the web was a neutral foundation, not the domain of one powerful company. But over the last decade, Google's Chrome grew to dominate browsing, and Mozilla's browser has failed to gain a significant foothold on mobile devices.