  We demonstrate that a thermal metal of Majorana fermions forms in a
two-dimensional system of interacting non-Abelian (Ising) anyons in the
presence of moderate disorder. This bulk metallic phase arises in the $\nu=5/2$
quantum Hall state when disorder pins the anyonic quasiparticles. More
generally, it naturally occurs for various proposed systems supporting Majorana
fermion zero modes when disorder induces the random pinning of a finite density
of vortices. This includes all two-dimensional topological superconductors in
so-called symmetry class D. A distinct experimental signature of the thermal
metal phase is the presence of bulk heat transport down to zero temperature.
