@jsantell lately published a new tool for three.js developers at the Chrome web store. The three.js developers tools enhance your Chrome dev tools with an additional panel that provides various options like:
Inspect the structure/hierarchy of a three.js scene
Change properties of 3D objects, materials, textures or lights at runtime
Inspect statistical information about the graphics board memory and the rendering process (see WebGLRenderer.info)
Please note that the tool is still in an experimental stage. If you have ideas to make the tool even better or if you encounter any bugs, feel free to create an issue at the respective github repository.