diff --git a/layout/mathml/nsMathMLmoFrame.cpp b/layout/mathml/nsMathMLmoFrame.cpp
index 489697f0e3199..e27709c0b0e5b 100644
--- a/layout/mathml/nsMathMLmoFrame.cpp
+++ b/layout/mathml/nsMathMLmoFrame.cpp
@@ -596,9 +596,15 @@ nsMathMLmoFrame::Stretch(DrawTarget* aDrawTarget,
 
   // get the leading to be left at the top and the bottom of the stretched char
   // this seems more reliable than using fm->GetLeading() on suspicious fonts
-  nscoord em;
-  GetEmHeight(fm, em);
-  nscoord leading = NSToCoordRound(0.2f * em);
+  const nscoord leading = [&fm] {
+    if (StaticPrefs::
+            mathml_top_bottom_spacing_for_stretchy_operators_disabled()) {
+      return 0;
+    }
+    nscoord em;
+    GetEmHeight(fm, em);
+    return NSToCoordRound(0.2f * (float)em);
+  }();
 
   // Operators that are stretchy, or those that are to be centered
   // to cater for fonts that are not math-aware, are handled by the MathMLChar
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index 57ac414488ec2..a4b93d3fd2c07 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -9548,6 +9548,13 @@
   mirror: always
   rust: true
 
+# Whether to disable extra top/bottom spacing for stretchy operators.
+- name: mathml.top_bottom_spacing_for_stretchy_operators.disabled
+  type: bool
+  value: true
+  mirror: always
+  rust: true
+
 #---------------------------------------------------------------------------
 # Prefs starting with "media."
 #---------------------------------------------------------------------------
diff --git a/testing/web-platform/meta/mathml/presentation-markup/mrow/stretch-along-block-axis-001.html.ini b/testing/web-platform/meta/mathml/presentation-markup/mrow/stretch-along-block-axis-001.html.ini
index 918e9dcb02ccb..a8cbc937df6b3 100644
--- a/testing/web-platform/meta/mathml/presentation-markup/mrow/stretch-along-block-axis-001.html.ini
+++ b/testing/web-platform/meta/mathml/presentation-markup/mrow/stretch-along-block-axis-001.html.ini
@@ -1,17 +1,6 @@
 [stretch-along-block-axis-001.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
-  [Taking into account stretch axis.]
-    expected: FAIL
-
-  [Taking into account stretchy property.]
-    expected: FAIL
-
   [Only operators with a stretchy property and block stretch axis.]
     expected: FAIL
 
   [Operators smaller and larger than non-stretchy siblings.]
     expected: FAIL
-
-  [Embellished operators]
-    expected: FAIL
diff --git a/testing/web-platform/meta/mathml/presentation-markup/operators/mo-minsize-maxsize-001.html.ini b/testing/web-platform/meta/mathml/presentation-markup/operators/mo-minsize-maxsize-001.html.ini
index 363130b009562..843be0fe40a65 100644
--- a/testing/web-platform/meta/mathml/presentation-markup/operators/mo-minsize-maxsize-001.html.ini
+++ b/testing/web-platform/meta/mathml/presentation-markup/operators/mo-minsize-maxsize-001.html.ini
@@ -1,20 +1,6 @@
 [mo-minsize-maxsize-001.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
   [minsize < maxsize < 0 is treated as maxsize = minsize = 0]
     expected: FAIL
 
-  [minsize < 0 is treated as 0]
-    expected: FAIL
-
-  [target size = 0 is treated as Tascent = Tdescent = minsize/2]
-    expected: FAIL
-
-  [maxsize < minsize is treated as maxsize = minsize]
-    expected: FAIL
-
   [minsize/maxsize percentages are relative to the target size]
     expected: FAIL
-
-  [default minsize/maxsize percentages]
-    expected: FAIL
diff --git a/testing/web-platform/meta/mathml/presentation-markup/operators/mo-stretch-properties-001.html.ini b/testing/web-platform/meta/mathml/presentation-markup/operators/mo-stretch-properties-001.html.ini
deleted file mode 100644
index 294cf0bfb844e..0000000000000
--- a/testing/web-platform/meta/mathml/presentation-markup/operators/mo-stretch-properties-001.html.ini
+++ /dev/null
@@ -1,5 +0,0 @@
-[mo-stretch-properties-001.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
-  [Stretchy vertical line]
-    expected: FAIL
diff --git a/testing/web-platform/meta/mathml/presentation-markup/operators/mo-stretch-properties-dynamic-001.html.ini b/testing/web-platform/meta/mathml/presentation-markup/operators/mo-stretch-properties-dynamic-001.html.ini
deleted file mode 100644
index 78e9ccef75a21..0000000000000
--- a/testing/web-platform/meta/mathml/presentation-markup/operators/mo-stretch-properties-dynamic-001.html.ini
+++ /dev/null
@@ -1,17 +0,0 @@
-[mo-stretch-properties-dynamic-001.html]
-  expected:
-    if (os == "android") and fission: [OK, TIMEOUT]
-  [symmetric]
-    expected: FAIL
-
-  [largeop]
-    expected: FAIL
-
-  [minsize]
-    expected: FAIL
-
-  [maxsize]
-    expected: FAIL
-
-  [stretchy]
-    expected: FAIL
diff --git a/testing/web-platform/meta/mathml/presentation-markup/operators/stretchy-largeop-with-default-font-2.html.ini b/testing/web-platform/meta/mathml/presentation-markup/operators/stretchy-largeop-with-default-font-2.html.ini
new file mode 100644
index 0000000000000..6f91fd5fa9f2a
--- /dev/null
+++ b/testing/web-platform/meta/mathml/presentation-markup/operators/stretchy-largeop-with-default-font-2.html.ini
@@ -0,0 +1,4 @@
+[stretchy-largeop-with-default-font-2.html]
+  [Test that non-stretchy largeops are bigger in display mode.]
+    expected:
+      if os == "android": FAIL