Mozilla is committed to the next wave of creativity in the open Web, in which people can access, create and share immersive VR and AR experiences across platforms and devices. Together with the Khronos Group and developers of existing open source Blender tools, we are providing a complete GL Transmission Format (glTF) import and export add-on for Blender, offering a powerful and free round-trip workflow for WebXR creators. This effort builds on the work of existing open source tools, and adds support for the newest Blender and glTF features. The tool itself along with further technical details will be available in the coming weeks. The blueprint for the collaboration model that allowed us to get there already exists. This article will explain how we got there, how this model works, and why it can accelerate the ecosystem.