diff --git a/dom/canvas/WebGL2ContextFramebuffers.cpp b/dom/canvas/WebGL2ContextFramebuffers.cpp
index bd537d9aeedb..c3460e0f80ba 100644
--- a/dom/canvas/WebGL2ContextFramebuffers.cpp
+++ b/dom/canvas/WebGL2ContextFramebuffers.cpp
@@ -7,6 +7,7 @@
 
 #include "GLContext.h"
 #include "GLScreenBuffer.h"
+#include "mozilla/CheckedInt.h"
 #include "WebGLContextUtils.h"
 #include "WebGLFormats.h"
 #include "WebGLFramebuffer.h"
@@ -38,7 +39,23 @@ WebGL2Context::BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY
         return;
     }
 
-    ////
+    // --
+
+    const auto fnLikelyOverflow = [](GLint p0, GLint p1) {
+        auto checked = CheckedInt<GLint>(p1) - p0;
+        checked = -checked; // And check the negation!
+        return !checked.isValid();
+    };
+
+    if (fnLikelyOverflow(srcX0, srcX1) || fnLikelyOverflow(srcY0, srcY1) ||
+        fnLikelyOverflow(dstX0, dstX1) || fnLikelyOverflow(dstY0, dstY1))
+    {
+        ErrorInvalidValue("blitFramebuffer: Likely-to-overflow large ranges are"
+                          " forbidden.");
+        return;
+    }
+
+    // --
 
     if (!ValidateAndInitFB("blitFramebuffer: READ_FRAMEBUFFER", mBoundReadFramebuffer) ||
         !ValidateAndInitFB("blitFramebuffer: DRAW_FRAMEBUFFER", mBoundDrawFramebuffer))
diff --git a/dom/canvas/test/webgl-conf/mochitest-errata.ini b/dom/canvas/test/webgl-conf/mochitest-errata.ini
index 19e7e51333aa..99569a3bba6d 100644
--- a/dom/canvas/test/webgl-conf/mochitest-errata.ini
+++ b/dom/canvas/test/webgl-conf/mochitest-errata.ini
@@ -1199,6 +1199,3 @@ skip-if = (os == 'win')
 skip-if = (os == 'win')
 [generated/test_2_conformance__textures__misc__tex-video-using-tex-unit-non-zero.html]
 skip-if = (os == 'win')
-[generated/test_2_conformance2__rendering__blitframebuffer-size-overflow.html]
-# Bug 1472894
-skip-if = (os == 'win')