--- a/dom/canvas/WebGLContextValidate.cpp
+++ b/dom/canvas/WebGLContextValidate.cpp
@@ -534,31 +534,16 @@ WebGLContext::InitAndValidateGL(FailureR
             mImplMax3DTextureSize = 0;
         if (!gl->GetPotentialInteger(LOCAL_GL_MAX_ARRAY_TEXTURE_LAYERS, (GLint*)&mImplMaxArrayTextureLayers))
             mImplMaxArrayTextureLayers = 0;
 
         gl->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_IMAGE_UNITS, &mGLMaxTextureImageUnits);
         gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &mGLMaxVertexTextureImageUnits);
     }
 
-    // If we don't support a target, its max size is 0. We should only floor-to-POT if the
-    // value if it's non-zero. (NB log2(0) is -Inf, so zero isn't an integer power-of-two)
-    const auto fnFloorPOTIfSupported = [](uint32_t& val) {
-        if (val) {
-            val = FloorPOT(val);
-        }
-    };
-
-    fnFloorPOTIfSupported(mImplMaxTextureSize);
-    fnFloorPOTIfSupported(mImplMaxCubeMapTextureSize);
-    fnFloorPOTIfSupported(mImplMaxRenderbufferSize);
-
-    fnFloorPOTIfSupported(mImplMax3DTextureSize);
-    fnFloorPOTIfSupported(mImplMaxArrayTextureLayers);
-
     ////////////////
 
     mGLMaxColorAttachments = 1;
     mGLMaxDrawBuffers = 1;
     gl->GetPotentialInteger(LOCAL_GL_MAX_COLOR_ATTACHMENTS,
                             (GLint*)&mGLMaxColorAttachments);
     gl->GetPotentialInteger(LOCAL_GL_MAX_DRAW_BUFFERS, (GLint*)&mGLMaxDrawBuffers);