diff --git a/front_end/core/common/ParsedURL.ts b/front_end/core/common/ParsedURL.ts
index 72c57172acc241981a356895de8db1a155116972..c07e08d92d9d797a06af30b088b4f7a110e8f0b2 100644
--- a/front_end/core/common/ParsedURL.ts
+++ b/front_end/core/common/ParsedURL.ts
@@ -64,6 +64,14 @@ export function normalizePath(path: string): string {
   return normalizedPath;
 }
 
+export function schemeIs(url: Platform.DevToolsPath.UrlString, scheme: string): boolean {
+  try {
+    return (new URL(url)).protocol === scheme;
+  } catch (e) {
+    return false;
+  }
+}
+
 export class ParsedURL {
   isValid: boolean;
   url: string;
diff --git a/front_end/core/sdk/DebuggerModel.ts b/front_end/core/sdk/DebuggerModel.ts
index 7bdc0387bff5e574bdfd09249c10b96066584ec1..6721d33efb59cb7185a97a3e612a6f9250453266 100644
--- a/front_end/core/sdk/DebuggerModel.ts
+++ b/front_end/core/sdk/DebuggerModel.ts
@@ -422,7 +422,7 @@ export class DebuggerModel extends SDKModel<EventTypes> {
       Promise<SetBreakpointResult> {
     // Convert file url to node-js path.
     let urlRegex;
-    if (this.target().type() === Type.Node && url.startsWith('file://')) {
+    if (this.target().type() === Type.Node && Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'file:')) {
       // TODO(crbug.com/1253323): Cast to UrlString will be removed when migration to branded types is complete.
       const platformPath =
           Common.ParsedURL.ParsedURL.capFilePrefix(url as Platform.DevToolsPath.UrlString, Host.Platform.isWin());
diff --git a/front_end/core/sdk/NetworkRequest.ts b/front_end/core/sdk/NetworkRequest.ts
index 5afb3f02802974bdd92659f4de60567de0798190..de663b33dd4b54985bbeb83b3a83d06672bc0e1c 100644
--- a/front_end/core/sdk/NetworkRequest.ts
+++ b/front_end/core/sdk/NetworkRequest.ts
@@ -408,7 +408,7 @@ export class NetworkRequest extends Common.ObjectWrapper.ObjectWrapper<EventType
   }
 
   isBlobRequest(): boolean {
-    return this.#urlInternal.startsWith('blob:');
+    return Common.ParsedURL.schemeIs(this.#urlInternal as Platform.DevToolsPath.UrlString, 'blob:');
   }
 
   setUrl(x: string): void {
diff --git a/front_end/core/sdk/SourceMap.ts b/front_end/core/sdk/SourceMap.ts
index cd18ce47dc76b264f3aa925fc0f8147ac892168d..50661b5a543d22729460f1f5b7688d04c9068e19 100644
--- a/front_end/core/sdk/SourceMap.ts
+++ b/front_end/core/sdk/SourceMap.ts
@@ -155,7 +155,7 @@ export class TextSourceMap implements SourceMap {
     this.#json = payload;
     this.#compiledURLInternal = compiledURL;
     this.#sourceMappingURL = sourceMappingURL;
-    this.#baseURL = sourceMappingURL.startsWith('data:') ? compiledURL : sourceMappingURL;
+    this.#baseURL = (Common.ParsedURL.schemeIs(sourceMappingURL as Platform.DevToolsPath.UrlString, 'data:')) ? compiledURL : sourceMappingURL;
 
     this.#mappingsInternal = null;
     this.#sourceInfos = new Map();
diff --git a/front_end/models/bindings/DebuggerLanguagePlugins.ts b/front_end/models/bindings/DebuggerLanguagePlugins.ts
index ac3d27e78c49493fb52694e844791e081e51153a..409388b5fa7afd1d8b07fab1ec25a151885b98b4 100644
--- a/front_end/models/bindings/DebuggerLanguagePlugins.ts
+++ b/front_end/models/bindings/DebuggerLanguagePlugins.ts
@@ -1,7 +1,7 @@
 // Copyright 2020 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
+import * as Platform from '../../core/platform/platform.js';
 import * as Common from '../../core/common/common.js';
 import * as i18n from '../../core/i18n/i18n.js';
 import * as SDK from '../../core/sdk/sdk.js';
@@ -1077,7 +1077,7 @@ export class DebuggerLanguagePluginManager implements
             console.log(i18nString(UIStrings.loadingDebugSymbolsFor, {PH1: plugin.name, PH2: url}));
           }
           try {
-            const code = (!symbolsUrl && url.startsWith('wasm://')) ? await script.getWasmBytecode() : undefined;
+            const code = (!symbolsUrl && Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'wasm:')) ? await script.getWasmBytecode() : undefined
             const sourceFileURLs = await plugin.addRawModule(rawModuleId, symbolsUrl, {url, code});
             // Check that the handle isn't stale by now. This works because the code that assigns to
             // `rawModuleHandle` below will run before this code because of the `await` in the preceding
diff --git a/front_end/models/bindings/ResourceMapping.ts b/front_end/models/bindings/ResourceMapping.ts
index 80975fb52e78f9dc26a54513c18a3577e7fb687f..7d6ba908e2d0a181ca1fda4b5f350ee603842a58 100644
--- a/front_end/models/bindings/ResourceMapping.ts
+++ b/front_end/models/bindings/ResourceMapping.ts
@@ -1,7 +1,7 @@
 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
-
+import * as Platform from '../../core/platform/platform.js';
 import * as Common from '../../core/common/common.js';
 import * as SDK from '../../core/sdk/sdk.js';
 import * as TextUtils from '../text_utils/text_utils.js';
@@ -223,7 +223,7 @@ class ModelInfo {
     }
     if ((resourceType === Common.ResourceType.resourceTypes.Image ||
          resourceType === Common.ResourceType.resourceTypes.Font) &&
-        resource.contentURL().startsWith('data:')) {
+         Common.ParsedURL.schemeIs(resource.contentURL() as Platform.DevToolsPath.UrlString, 'data:')) {
       return false;
     }
     return true;
diff --git a/front_end/models/issues_manager/SameSiteCookieIssue.ts b/front_end/models/issues_manager/SameSiteCookieIssue.ts
index 063088dd87a1847464f1e56551ae99c6ee46749b..394980178f6c9515dd95571fcdec0ff62e28e09b 100644
--- a/front_end/models/issues_manager/SameSiteCookieIssue.ts
+++ b/front_end/models/issues_manager/SameSiteCookieIssue.ts
@@ -5,6 +5,7 @@
 
 import * as Common from '../../core/common/common.js';
 import * as i18n from '../../core/i18n/i18n.js';
+import type * as Platform from '../../core/platform/platform.js';
 import * as SDK from '../../core/sdk/sdk.js';
 import * as Protocol from '../../generated/protocol.js';
 
@@ -76,7 +77,7 @@ export class SameSiteCookieIssue extends Issue {
       for (const exclusionReason of sameSiteDetails.cookieExclusionReasons) {
         const code = SameSiteCookieIssue.codeForSameSiteDetails(
             exclusionReason, sameSiteDetails.cookieWarningReasons, sameSiteDetails.operation,
-            sameSiteDetails.cookieUrl);
+            sameSiteDetails.cookieUrl as Platform.DevToolsPath.UrlString | undefined);
         if (code) {
           issues.push(new SameSiteCookieIssue(code, sameSiteDetails, issuesModel));
         }
@@ -88,7 +89,8 @@ export class SameSiteCookieIssue extends Issue {
       for (const warningReason of sameSiteDetails.cookieWarningReasons) {
         // warningReasons should be an empty array here.
         const code = SameSiteCookieIssue.codeForSameSiteDetails(
-            warningReason, [], sameSiteDetails.operation, sameSiteDetails.cookieUrl);
+            warningReason, [], sameSiteDetails.operation,
+	    sameSiteDetails.cookieUrl as Platform.DevToolsPath.UrlString | undefined);
         if (code) {
           issues.push(new SameSiteCookieIssue(code, sameSiteDetails, issuesModel));
         }
@@ -106,8 +108,9 @@ export class SameSiteCookieIssue extends Issue {
   static codeForSameSiteDetails(
       reason: Protocol.Audits.SameSiteCookieExclusionReason|Protocol.Audits.SameSiteCookieWarningReason,
       warningReasons: Protocol.Audits.SameSiteCookieWarningReason[], operation: Protocol.Audits.SameSiteCookieOperation,
-      cookieUrl?: string): string|null {
-    const isURLSecure = cookieUrl && (cookieUrl.startsWith('https://') || cookieUrl.startsWith('wss://'));
+      cookieUrl?: Platform.DevToolsPath.UrlString): string|null {
+    const isURLSecure =
+        cookieUrl && (Common.ParsedURL.schemeIs(cookieUrl, 'https:') || Common.ParsedURL.schemeIs(cookieUrl, 'wss:'));
     const secure = isURLSecure ? 'Secure' : 'Insecure';
 
     if (reason === Protocol.Audits.SameSiteCookieExclusionReason.ExcludeSameSiteStrict ||
diff --git a/front_end/models/logs/NetworkLog.ts b/front_end/models/logs/NetworkLog.ts
index 60b5cc2a3299d1d2ac74c589f4bef1201ce9616a..641e4a4a08c681ddf1366de2072782965be48724 100644
--- a/front_end/models/logs/NetworkLog.ts
+++ b/front_end/models/logs/NetworkLog.ts
@@ -327,7 +327,7 @@ export class NetworkLog extends Common.ObjectWrapper.ObjectWrapper<EventTypes> i
     // If a page resulted in an error, the browser will navigate to an internal error page
     // hosted at 'chrome-error://...'. In this case, skip the frame navigated event to preserve
     // the network log.
-    if (mainFrame.url !== mainFrame.unreachableUrl() && mainFrame.url.startsWith('chrome-error://')) {
+    if (mainFrame.url !== mainFrame.unreachableUrl() && Common.ParsedURL.schemeIs(mainFrame.url as Platform.DevToolsPath.UrlString, 'chrome-error:')) {
       return;
     }
 
diff --git a/front_end/models/persistence/Automapping.ts b/front_end/models/persistence/Automapping.ts
index cc30a0196b89f97c08d9b7b97d1e6d5fef6979d8..2c6d63cdc4f34ec3a7fe7de7bfd01bc6e3b14a5f 100644
--- a/front_end/models/persistence/Automapping.ts
+++ b/front_end/models/persistence/Automapping.ts
@@ -192,7 +192,7 @@ export class Automapping {
     if (this.interceptors.some(interceptor => interceptor(networkSourceCode))) {
       return;
     }
-    if (networkSourceCode.url().startsWith('wasm://')) {
+    if (Common.ParsedURL.schemeIs(networkSourceCode.url() as Platform.DevToolsPath.UrlString, 'wasm:')) {
       return;
     }
     const createBindingPromise =
@@ -322,7 +322,7 @@ export class Automapping {
 
   private createBinding(networkSourceCode: Workspace.UISourceCode.UISourceCode): Promise<AutomappingStatus|null> {
     const url = networkSourceCode.url();
-    if (url.startsWith('file://') || url.startsWith('snippet://')) {
+    if (Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'file:') || Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'snippet:')) {
       const decodedUrl = sanitizeSourceUrl(url);
       if (!decodedUrl) {
         return Promise.resolve(null as AutomappingStatus | null);
diff --git a/front_end/models/persistence/NetworkPersistenceManager.ts b/front_end/models/persistence/NetworkPersistenceManager.ts
index 4745df8fe1b62f0b1dfb38eeba0f672852e605e0..a086dd5fe3d78aee4b71d10e23f0bf1ee0200ae9 100644
--- a/front_end/models/persistence/NetworkPersistenceManager.ts
+++ b/front_end/models/persistence/NetworkPersistenceManager.ts
@@ -331,7 +331,7 @@ export class NetworkPersistenceManager extends Common.ObjectWrapper.ObjectWrappe
   }
 
   private canHandleNetworkUISourceCode(uiSourceCode: Workspace.UISourceCode.UISourceCode): boolean {
-    return this.activeInternal && !uiSourceCode.url().startsWith('snippet://');
+    return this.activeInternal && !Common.ParsedURL.schemeIs(uiSourceCode.url() as Platform.DevToolsPath.UrlString, 'snippet:');
   }
 
   private async networkUISourceCodeAdded(uiSourceCode: Workspace.UISourceCode.UISourceCode): Promise<void> {
diff --git a/front_end/models/persistence/PersistenceActions.ts b/front_end/models/persistence/PersistenceActions.ts
index 23f9b7adbb6a761908509e5bbc932aa8cfda13fa..8cac6bccfd7beae35ce1f108f3d3475fb5c9d682 100644
--- a/front_end/models/persistence/PersistenceActions.ts
+++ b/front_end/models/persistence/PersistenceActions.ts
@@ -92,7 +92,7 @@ export class ContextMenuProvider implements UI.ContextMenu.Provider {
 
     const binding = uiSourceCode && PersistenceImpl.instance().binding(uiSourceCode);
     const fileURL = binding ? binding.fileSystem.contentURL() : contentProvider.contentURL();
-    if (fileURL.startsWith('file://')) {
+    if (Common.ParsedURL.schemeIs(fileURL as Platform.DevToolsPath.UrlString, 'file:')) {
       // TODO(crbug.com/1253323): Cast to UrlString will be removed when migration to branded types is complete.
       const path =
           Common.ParsedURL.ParsedURL.capFilePrefix(fileURL as Platform.DevToolsPath.UrlString, Host.Platform.isWin());
diff --git a/front_end/models/persistence/PersistenceUtils.ts b/front_end/models/persistence/PersistenceUtils.ts
index 0caad032d4a32e221b762420713b82913ceb040d..ce90fabf051944476713f35a323b1c328c5146e0 100644
--- a/front_end/models/persistence/PersistenceUtils.ts
+++ b/front_end/models/persistence/PersistenceUtils.ts
@@ -48,7 +48,7 @@ export class PersistenceUtils {
   static iconForUISourceCode(uiSourceCode: Workspace.UISourceCode.UISourceCode): UI.Icon.Icon|null {
     const binding = PersistenceImpl.instance().binding(uiSourceCode);
     if (binding) {
-      if (!binding.fileSystem.url().startsWith('file://')) {
+      if (!Common.ParsedURL.schemeIs(binding.fileSystem.url() as Platform.DevToolsPath.UrlString, 'file:')) {
         return null;
       }
       const icon = UI.Icon.Icon.create('mediumicon-file-sync');
@@ -60,7 +60,7 @@ export class PersistenceUtils {
       return icon;
     }
     if (uiSourceCode.project().type() !== Workspace.Workspace.projectTypes.FileSystem ||
-        !uiSourceCode.url().startsWith('file://')) {
+        !Common.ParsedURL.schemeIs(uiSourceCode.url() as Platform.DevToolsPath.UrlString, 'file:')) {
       return null;
     }
 
diff --git a/front_end/panels/console/ConsoleContextSelector.ts b/front_end/panels/console/ConsoleContextSelector.ts
index df37f9e4245be9ba92814a210deb119d06a46188..feb902658c0aed1880bd156a5a3648cd9e86aec1 100644
--- a/front_end/panels/console/ConsoleContextSelector.ts
+++ b/front_end/panels/console/ConsoleContextSelector.ts
@@ -226,7 +226,7 @@ export class ConsoleContextSelector implements SDK.TargetManager.SDKModelObserve
       const resourceTreeModel = target.model(SDK.ResourceTreeModel.ResourceTreeModel);
       frame = resourceTreeModel && resourceTreeModel.frameForId(executionContext.frameId);
     }
-    if (executionContext.origin.startsWith('chrome-extension://')) {
+    if (Common.ParsedURL.schemeIs(executionContext.origin as Platform.DevToolsPath.UrlString, 'chrome-extension:')) {
       return i18nString(UIStrings.extension);
     }
     const sameTargetParentFrame = frame && frame.sameTargetParentFrame();
diff --git a/front_end/panels/console/ConsoleFormat.ts b/front_end/panels/console/ConsoleFormat.ts
index 6fd5e8fa48b83a3ac57a098414867f53f164d91d..20e60ffa2601f80faa924f1e3023933390522735 100644
--- a/front_end/panels/console/ConsoleFormat.ts
+++ b/front_end/panels/console/ConsoleFormat.ts
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import * as Common from '../../core/common/common.js';
+import type * as Platform from '../../core/platform/platform.js';
 import type * as SDK from '../../core/sdk/sdk.js';
 
 // VGA color palette
@@ -216,7 +218,8 @@ export const updateStyle = (currentStyle: Map<string, {value: string, priority:
     // If any of them is not a `data` URL, we skip the whole property.
     const value = buffer.style.getPropertyValue(property);
     const potentialUrls = [...value.matchAll(URL_REGEX)].map(match => match[1]);
-    if (potentialUrls.some(potentialUrl => !potentialUrl.startsWith('data:'))) {
+    if (potentialUrls.some(
+            potentialUrl => !Common.ParsedURL.schemeIs(potentialUrl as Platform.DevToolsPath.UrlString, 'data:'))) {
       continue;
     }
     currentStyle.set(property, {
diff --git a/front_end/panels/coverage/CoverageModel.ts b/front_end/panels/coverage/CoverageModel.ts
index 58e166c544a2deb976823011b7712439baa625f0..f0fb375eab36464009e70d141a14349dc8017632 100644
--- a/front_end/panels/coverage/CoverageModel.ts
+++ b/front_end/panels/coverage/CoverageModel.ts
@@ -469,7 +469,7 @@ export class CoverageModel extends SDK.SDKModel.SDKModel<EventTypes> {
         continue;
       }
       const url = urlInfo.url();
-      if (url.startsWith('extensions::') || url.startsWith('chrome-extension://')) {
+      if (url.startsWith('extensions::') || Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'chrome-extension:')) {
         continue;
       }
       result.push(...await urlInfo.entriesForExport());
diff --git a/front_end/panels/snippets/ScriptSnippetFileSystem.ts b/front_end/panels/snippets/ScriptSnippetFileSystem.ts
index 12e28a01786a0aa596bca1923a0edb9697000761..dba702d01ef3b12bc715d8b2324cd2f89559498d 100644
--- a/front_end/panels/snippets/ScriptSnippetFileSystem.ts
+++ b/front_end/panels/snippets/ScriptSnippetFileSystem.ts
@@ -136,7 +136,7 @@ export class SnippetFileSystem extends Persistence.PlatformFileSystem.PlatformFi
 }
 
 export async function evaluateScriptSnippet(uiSourceCode: Workspace.UISourceCode.UISourceCode): Promise<void> {
-  if (!uiSourceCode.url().startsWith('snippet://')) {
+  if (!Common.ParsedURL.schemeIs(uiSourceCode.url() as Platform.DevToolsPath.UrlString, 'snippet:')) {
     return;
   }
 
@@ -191,7 +191,7 @@ export async function evaluateScriptSnippet(uiSourceCode: Workspace.UISourceCode
 }
 
 export function isSnippetsUISourceCode(uiSourceCode: Workspace.UISourceCode.UISourceCode): boolean {
-  return uiSourceCode.url().startsWith('snippet://');
+  return Common.ParsedURL.schemeIs(uiSourceCode.url() as Platform.DevToolsPath.UrlString, 'snippet:');
 }
 
 export function isSnippetsProject(project: Workspace.Workspace.Project): boolean {
diff --git a/front_end/panels/timeline/TimelineUIUtils.ts b/front_end/panels/timeline/TimelineUIUtils.ts
index d94ead6987096a3d0dcae571774ca9d55d952c30..01b2c986ea2484717d12d7bba4af788c06087069 100644
--- a/front_end/panels/timeline/TimelineUIUtils.ts
+++ b/front_end/panels/timeline/TimelineUIUtils.ts
@@ -3392,8 +3392,8 @@ export class TimelineUIUtils {
     if (!trimAt) {
       trimAt = 30;
     }
-    return url.startsWith('about:') ? `"${Platform.StringUtilities.trimMiddle(frame.name, trimAt)}"` :
-                                      frame.url.trimEnd(trimAt);
+    return Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'about:') ? `"${Platform.StringUtilities.trimMiddle(frame.name, trimAt)}"` :
+                                                                                         frame.url.trimEnd(trimAt);
   }
 }
 
diff --git a/front_end/ui/legacy/components/utils/Linkifier.ts b/front_end/ui/legacy/components/utils/Linkifier.ts
index b0efe3c7ed407de4a0b2d8fa1f6488d17c61e295..797043bce87d822646af6d490032cbfcf8fc12a5 100644
--- a/front_end/ui/legacy/components/utils/Linkifier.ts
+++ b/front_end/ui/legacy/components/utils/Linkifier.ts
@@ -27,7 +27,7 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
-
+import * as Platform from '../../../../core/platform/platform.js';
 import * as Common from '../../../../core/common/common.js';
 import * as Host from '../../../../core/host/host.js';
 import * as i18n from '../../../../core/i18n/i18n.js';
@@ -516,7 +516,7 @@ export class Linkifier implements SDK.TargetManager.Observer {
     const preventClick = options.preventClick;
     const maxLength = options.maxLength || UI.UIUtils.MaxLengthForDisplayedURLs;
     const bypassURLTrimming = options.bypassURLTrimming;
-    if (!url || url.trim().toLowerCase().startsWith('javascript:')) {
+    if (!url || Common.ParsedURL.schemeIs(url as Platform.DevToolsPath.UrlString, 'javascript:')) {
       const element = document.createElement('span');
       if (className) {
         element.className = className;