diff --git a/dom/base/nsDOMAttributeMap.h b/dom/base/nsDOMAttributeMap.h
index 044001ca5063..d9206c3ece56 100644
--- a/dom/base/nsDOMAttributeMap.h
+++ b/dom/base/nsDOMAttributeMap.h
@@ -172,7 +172,7 @@ class nsDOMAttributeMap final : public nsISupports, public nsWrapperCache {
   Attr* GetAttribute(mozilla::dom::NodeInfo* aNodeInfo);
 };
 
-// XXX khuey yes this is crazy.  The bindings code needs to see this include,
+// XXX khuey yes this is strange.  The bindings code needs to see this include,
 // but if we pull it in at the top of the file we get a circular include
 // problem.
 #include "mozilla/dom/Element.h"
diff --git a/dom/canvas/test/reftest/reftest.list b/dom/canvas/test/reftest/reftest.list
index fbf52c4e72be..f9b961921554 100644
--- a/dom/canvas/test/reftest/reftest.list
+++ b/dom/canvas/test/reftest/reftest.list
@@ -25,7 +25,7 @@ skip-if(Android) == webgl-resize-test.html  wrapper.html?green.png
 # Check that captureStream() displays in a local video element
 skip-if(Android) == webgl-capturestream-test.html?preserve wrapper.html?green.png
 
-# Some of the failure conditions are a little crazy. I'm (jgilbert) setting these based on
+# Some of the failure conditions are a little weird. I'm (jgilbert) setting these based on
 # failures encountered when running on Try, and then targetting the Try config by
 # differences in the `sandbox` contents. That is, I'm labeling based on symptoms rather
 # than cause.
diff --git a/dom/canvas/test/test_canvas.html b/dom/canvas/test/test_canvas.html
index 1cbfe77d5004..764e9c252bd8 100644
--- a/dom/canvas/test/test_canvas.html
+++ b/dom/canvas/test/test_canvas.html
@@ -11345,7 +11345,7 @@ isPixel(ctx, 98,48, 0,255,0,255, 0);
 <!-- [[[ test_2d.path.arc.shape.5.html ]]] -->
 
 <p>Canvas test: 2d.path.arc.shape.5</p>
-<!-- Testing: arc() from 0 to 5pi does not draw crazy things -->
+<!-- Testing: arc() from 0 to 5pi does not draw strange things -->
 <canvas id="c351" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
 <script>
 
@@ -22098,7 +22098,7 @@ isPixel(ctx, 98,48, 0,255,0,255, 0);
 <!-- [[[ test_2d.path.ellipse.shape.4.html ]]] -->
 
 <p>Canvas test: 2d.path.ellipse.shape.4</p>
-<!-- Testing: ellipse() from 0 to 5pi does not draw crazy things -->
+<!-- Testing: ellipse() from 0 to 5pi does not draw strange things -->
 <canvas id="c708" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>
 <script>
 
diff --git a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/ogles-utils.js b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/ogles-utils.js
index b2a150049636..1a3f5ca191df 100644
--- a/dom/canvas/test/webgl-conf/checkout/conformance/ogles/ogles-utils.js
+++ b/dom/canvas/test/webgl-conf/checkout/conformance/ogles/ogles-utils.js
@@ -33,7 +33,7 @@ function compareImages(refData, tstData, width, height, diff) {
       return true;
     }
 
-    // TODO: Implement crazy check that's used in OpenGL ES 2.0 conformance tests.
+    // TODO: Implement check that's used in OpenGL ES 2.0 conformance tests.
     // NOTE: on Desktop things seem to be working. Maybe the more complex check
     // is needed for embedded systems?
     return false;
diff --git a/dom/ipc/StructuredCloneData.h b/dom/ipc/StructuredCloneData.h
index 1da9ff52dadb..524f088159d6 100644
--- a/dom/ipc/StructuredCloneData.h
+++ b/dom/ipc/StructuredCloneData.h
@@ -130,7 +130,7 @@ class SharedJSAllocatedData final {
  *   returning a fatal false if unable to extract.  (And
  *   SerializedStructuredCloneBuffer wraps/defers to it.)  But if it's possible
  *   the ClonedMessageData came from a different source that might have borrowed
- *   the buffers itself, then things will crash.  That would be a pretty crazy
+ *   the buffers itself, then things will crash.  That would be a pretty strange
  *   implementation; if you see one, change it to use SharedJSAllocatedData.
  *
  * 1: Specifically, in the Write() case an owning SharedJSAllocatedData is
diff --git a/dom/media/mp4/MP4Metadata.cpp b/dom/media/mp4/MP4Metadata.cpp
index a1c78a6d2099..4cd3e681ded4 100644
--- a/dom/media/mp4/MP4Metadata.cpp
+++ b/dom/media/mp4/MP4Metadata.cpp
@@ -336,7 +336,7 @@ MP4Metadata::ResultAndTrackInfo MP4Metadata::GetTrackInfo(
           ("track codec %s (%u)\n", codecString, codecType));
 #endif
 
-  // This specialization interface is crazy.
+  // This specialization interface is wild.
   UniquePtr<mozilla::TrackInfo> e;
   switch (aType) {
     case TrackInfo::TrackType::kAudioTrack: {
diff --git a/dom/media/webrtc/sdp/SdpAttribute.h b/dom/media/webrtc/sdp/SdpAttribute.h
index 66715f830c2f..bb00078cdd3a 100644
--- a/dom/media/webrtc/sdp/SdpAttribute.h
+++ b/dom/media/webrtc/sdp/SdpAttribute.h
@@ -377,7 +377,7 @@ class SdpFingerprintAttributeList : public SdpAttribute {
   };
 
   // For use by application programmers. Enforces that it's a known and
-  // non-crazy algorithm.
+  // reasonable algorithm.
   void PushEntry(std::string algorithm_str,
                  const std::vector<uint8_t>& fingerprint,
                  bool enforcePlausible = true) {
diff --git a/dom/tests/mochitest/ajax/mochikit/MochiKit/Signal.js b/dom/tests/mochitest/ajax/mochikit/MochiKit/Signal.js
index 3e578916029c..fd267a994e96 100644
--- a/dom/tests/mochitest/ajax/mochikit/MochiKit/Signal.js
+++ b/dom/tests/mochitest/ajax/mochikit/MochiKit/Signal.js
@@ -222,7 +222,7 @@ MochiKit.Base.update(MochiKit.Signal.Event.prototype, {
                 shift+1 kp      33
 
                 Safari key event behavior:
-                (Safari sets charCode and keyCode to something crazy for
+                (Safari sets charCode and keyCode to something weird for
                 special keys.)
                 key     event   charCode    keyCode
                 DOWN    ku,kd   63233       40
diff --git a/dom/u2f/tests/frame_appid_facet.html b/dom/u2f/tests/frame_appid_facet.html
index e8fc1158e698..4abe888eac52 100644
--- a/dom/u2f/tests/frame_appid_facet.html
+++ b/dom/u2f/tests/frame_appid_facet.html
@@ -66,7 +66,7 @@ async function doTests() {
   });
 
   // Test: TLD
-  await promiseU2FRegister("https://com/crazyAppID", [{
+  await promiseU2FRegister("https://com/weirdAppID", [{
       version,
       challenge: bytesToBase64UrlSafe(challenge),
     }], [], function(res){
diff --git a/dom/workers/test/json_worker.js b/dom/workers/test/json_worker.js
index 480a7e5e321b..fcde60061cde 100644
--- a/dom/workers/test/json_worker.js
+++ b/dom/workers/test/json_worker.js
@@ -8,7 +8,7 @@ cyclicalObject.foo = cyclicalObject;
 var cyclicalArray = [];
 cyclicalArray.push(cyclicalArray);
 
-function makeCrazyNested(obj, count) {
+function makeNested(obj, count) {
   var innermostobj;
   for (var i = 0; i < count; i++) {
     obj.foo = { bar: 5 };
@@ -18,12 +18,12 @@ function makeCrazyNested(obj, count) {
   return innermostobj;
 }
 
-var crazyNestedObject = {};
-makeCrazyNested(crazyNestedObject, 100);
+var nestedObject = {};
+makeNested(nestedObject, 100);
 
-var crazyCyclicalObject = {};
-var innermost = makeCrazyNested(crazyCyclicalObject, 1000);
-innermost.baz = crazyCyclicalObject;
+var cyclicalObject = {};
+var innermost = makeNested(cyclicalObject, 1000);
+innermost.baz = cyclicalObject;
 
 var objectWithSaneGetter = {};
 objectWithSaneGetter.__defineGetter__("foo", function() {
@@ -103,12 +103,12 @@ var messages = [
   },
   {
     type: "object",
-    value: crazyNestedObject,
-    jsonValue: JSON.stringify(crazyNestedObject),
+    value: nestedObject,
+    jsonValue: JSON.stringify(nestedObject),
   },
   {
     type: "object",
-    value: crazyCyclicalObject,
+    value: cyclicalObject,
   },
   {
     type: "object",