Debugging Firefox with RenderDoc

I’m interested in debugging Firefox through RenderDoc. Debugging web browsers is “officially” not supported by the author of RenderDoc, however, on my team we have found RenderDoc indispensable for debugging our WebGL site, which we are able to do in Chrome with some coaxing to make RenderDoc attach to the process.

The only documentation I’ve found for RenderDoc in Firefox is at Debugging WebRender ; however, I haven’t had any luck getting it to work. Even though I adjusted the config flags as described, RenderDoc can’t attach to any API.

Has anyone else been able to attach RenderDoc to Firefox?