diff --git a/packages/react-devtools-extensions/src/parseHookNames.js b/packages/react-devtools-extensions/src/parseHookNames.js
index dc2b8b3c4bc92..9d183375e8052 100644
--- a/packages/react-devtools-extensions/src/parseHookNames.js
+++ b/packages/react-devtools-extensions/src/parseHookNames.js
@@ -27,7 +27,6 @@ import type {Thenable} from 'shared/ReactTypes';
 import type {SourceConsumer} from './astUtils';
 
 const SOURCE_MAP_REGEX = / ?sourceMappingURL=([^\s'"]+)/gm;
-const ABSOLUTE_URL_REGEX = /^https?:\/\//i;
 const MAX_SOURCE_LENGTH = 100_000_000;
 
 type AST = mixed;
@@ -282,14 +281,7 @@ function extractAndLoadSourceMaps(
           }
 
           let url = sourceMappingURLs[i].split('=')[1];
-          if (ABSOLUTE_URL_REGEX.test(url)) {
-            const baseURL = url.slice(0, url.lastIndexOf('/'));
-            url = `${baseURL}/${url}`;
-
-            if (!isValidUrl(url)) {
-              throw new Error(`Invalid source map URL "${url}"`);
-            }
-          } else if (!url.startsWith('/')) {
+          if (!url.startsWith('http') && !url.startsWith('/')) {
             // Resolve paths relative to the location of the file name
             const lastSlashIdx = runtimeSourceURL.lastIndexOf('/');
             if (lastSlashIdx !== -1) {
@@ -440,16 +432,6 @@ function findHookNames(
   return map;
 }
 
-function isValidUrl(possibleURL: string): boolean {
-  try {
-    // eslint-disable-next-line no-new
-    new URL(possibleURL);
-  } catch (_) {
-    return false;
-  }
-  return true;
-}
-
 function loadSourceFiles(
   locationKeyToHookSourceData: Map<string, HookSourceData>,
 ): Promise<*> {
diff --git a/packages/react-devtools-shared/src/backend/renderer.js b/packages/react-devtools-shared/src/backend/renderer.js
index d56819a8ba0bd..57b3de2e08a49 100644
--- a/packages/react-devtools-shared/src/backend/renderer.js
+++ b/packages/react-devtools-shared/src/backend/renderer.js
@@ -3240,6 +3240,17 @@ export function attach(
             // Never dehydrate the "hooks" object at the top levels.
             return true;
           }
+
+          if (
+            path[path.length - 2] === 'hookSource' &&
+            path[path.length - 1] === 'fileName'
+          ) {
+            // It's important to preserve the full file name (URL) for hook sources
+            // in case the user has enabled the named hooks feature.
+            // Otherwise the frontend may end up with a partial URL which it can't load.
+            return true;
+          }
+
           if (
             path[path.length - 1] === 'subHooks' ||
             path[path.length - 2] === 'subHooks'
diff --git a/packages/react-devtools-shared/src/hydration.js b/packages/react-devtools-shared/src/hydration.js
index 2c2d696089371..0b936462d5fe2 100644
--- a/packages/react-devtools-shared/src/hydration.js
+++ b/packages/react-devtools-shared/src/hydration.js
@@ -160,7 +160,12 @@ export function dehydrate(
       };
 
     case 'string':
-      return data.length <= 500 ? data : data.slice(0, 500) + '...';
+      isPathAllowedCheck = isPathAllowed(path);
+      if (isPathAllowedCheck) {
+        return data;
+      } else {
+        return data.length <= 500 ? data : data.slice(0, 500) + '...';
+      }
 
     case 'bigint':
       cleaned.push(path);