--- a/dom/canvas/WebGLTextureUpload.cpp
+++ b/dom/canvas/WebGLTextureUpload.cpp
@@ -1141,20 +1141,20 @@ WebGLTexture::TexStorage(const char* fun
         const auto lastLevel = uint32_t(levels - 1);
         if (lastLevel > 31)
             return false;
 
         const auto lastLevelWidth = uint32_t(width) >> lastLevel;
         const auto lastLevelHeight = uint32_t(height) >> lastLevel;
 
         // If these are all zero, then some earlier level was the final 1x1(x1) level.
-        bool ok = lastLevelWidth && lastLevelHeight;
+        bool ok = lastLevelWidth || lastLevelHeight;
         if (target == LOCAL_GL_TEXTURE_3D) {
             const auto lastLevelDepth = uint32_t(depth) >> lastLevel;
-            ok &= bool(lastLevelDepth);
+            ok |= bool(lastLevelDepth);
         }
         return ok;
     }();
     if (!levelsOk) {
         mContext->ErrorInvalidOperation("%s: Too many levels requested for the given"
                                         " dimensions. (levels: %u, width: %u, height: %u,"
                                         " depth: %u)",
                                         funcName, levels, width, height, depth);