--- a/dom/canvas/WebGLShaderValidator.cpp
+++ b/dom/canvas/WebGLShaderValidator.cpp
@@ -114,17 +114,17 @@ ShaderOutput(gl::GLContext* gl)
         case 330: return SH_GLSL_330_CORE_OUTPUT;
         case 400: return SH_GLSL_400_CORE_OUTPUT;
         case 410: return SH_GLSL_410_CORE_OUTPUT;
         case 420: return SH_GLSL_420_CORE_OUTPUT;
         case 430: return SH_GLSL_430_CORE_OUTPUT;
         case 440: return SH_GLSL_440_CORE_OUTPUT;
         case 450: return SH_GLSL_450_CORE_OUTPUT;
         default:
-            MOZ_CRASH("GFX: Unexpected GLSL version.");
+            MOZ_ASSERT(false, "GFX: Unexpected GLSL version.");
         }
     }
 
     return SH_GLSL_COMPATIBILITY_OUTPUT;
 }
 
 webgl::ShaderValidator*
 WebGLContext::CreateShaderValidator(GLenum shaderType) const