diff --git a/devtools/client/netmonitor/src/utils/mdn-utils.js b/devtools/client/netmonitor/src/utils/mdn-utils.js
index 9a551c31d60b..7bce807bebd5 100644
--- a/devtools/client/netmonitor/src/utils/mdn-utils.js
+++ b/devtools/client/netmonitor/src/utils/mdn-utils.js
@@ -26,6 +26,7 @@ const SUPPORTED_HEADERS = [
   "Allow",
   "Authorization",
   "Cache-Control",
+  "Clear-Site-Data",
   "Connection",
   "Content-Disposition",
   "Content-Encoding",
@@ -41,8 +42,11 @@ const SUPPORTED_HEADERS = [
   "DNT",
   "Date",
   "ETag",
+  "Early-Data",
   "Expect",
+  "Expect-CT",
   "Expires",
+  "Feature-Policy",
   "Forwarded",
   "From",
   "Host",
@@ -66,10 +70,13 @@ const SUPPORTED_HEADERS = [
   "Referrer-Policy",
   "Retry-After",
   "Server",
+  "Server-Timing",
   "Set-Cookie",
   "Set-Cookie2",
+  "SourceMap",
   "Strict-Transport-Security",
   "TE",
+  "Timing-Allow-Origin",
   "Tk",
   "Trailer",
   "Transfer-Encoding",
@@ -127,6 +134,8 @@ const SUPPORTED_HTTP_CODES = [
     "416",
     "417",
     "418",
+    "422",
+    "425",
     "426",
     "428",
     "429",