diff --git a/front_end/core/sdk/DebuggerModel.ts b/front_end/core/sdk/DebuggerModel.ts
index a749e3b86d..cc1d79b946 100644
--- a/front_end/core/sdk/DebuggerModel.ts
+++ b/front_end/core/sdk/DebuggerModel.ts
@@ -471,17 +471,11 @@ export class DebuggerModel extends SDKModel<EventTypes> {
   }
 
   async setBreakpointInAnonymousScript(
-      scriptId: Protocol.Runtime.ScriptId, scriptHash: string, lineNumber: number, columnNumber?: number,
-      condition?: string): Promise<SetBreakpointResult> {
+      scriptHash: string, lineNumber: number, columnNumber?: number, condition?: string): Promise<SetBreakpointResult> {
     const response = await this.agent.invoke_setBreakpointByUrl(
         {lineNumber: lineNumber, scriptHash: scriptHash, columnNumber: columnNumber, condition: condition});
-    const error = response.getError();
-    if (error) {
-      // Old V8 backend doesn't support scriptHash argument.
-      if (error !== 'Either url or urlRegex must be specified.') {
-        return {locations: [], breakpointId: null};
-      }
-      return this.setBreakpointBySourceId(scriptId, lineNumber, columnNumber, condition);
+    if (response.getError()) {
+      return {locations: [], breakpointId: null};
     }
     let locations: Location[] = [];
     if (response.locations) {
@@ -490,22 +484,6 @@ export class DebuggerModel extends SDKModel<EventTypes> {
     return {locations, breakpointId: response.breakpointId};
   }
 
-  private async setBreakpointBySourceId(
-      scriptId: Protocol.Runtime.ScriptId, lineNumber: number, columnNumber?: number,
-      condition?: string): Promise<SetBreakpointResult> {
-    // This method is required for backward compatibility with V8 before 6.3.275.
-    const response = await this.agent.invoke_setBreakpoint(
-        {location: {scriptId: scriptId, lineNumber: lineNumber, columnNumber: columnNumber}, condition: condition});
-    if (response.getError()) {
-      return {breakpointId: null, locations: []};
-    }
-    let actualLocation: Location[] = [];
-    if (response.actualLocation) {
-      actualLocation = [Location.fromPayload(this, response.actualLocation)];
-    }
-    return {locations: actualLocation, breakpointId: response.breakpointId};
-  }
-
   async removeBreakpoint(breakpointId: Protocol.Debugger.BreakpointId): Promise<void> {
     const response = await this.agent.invoke_removeBreakpoint({breakpointId});
     if (response.getError()) {
diff --git a/front_end/models/bindings/BreakpointManager.ts b/front_end/models/bindings/BreakpointManager.ts
index 61b7b7184a..a34b15c712 100644
--- a/front_end/models/bindings/BreakpointManager.ts
+++ b/front_end/models/bindings/BreakpointManager.ts
@@ -793,7 +793,6 @@ export class ModelBreakpoint {
           const script = loc.script() as SDK.Script.Script;
           return {
             url: script.sourceURL,
-            scriptId: script.scriptId,
             scriptHash: script.hash,
             lineNumber: loc.lineNumber,
             columnNumber: loc.columnNumber,
@@ -811,7 +810,6 @@ export class ModelBreakpoint {
           // really resolved.
           const position = {
             url: this.#breakpoint.url(),
-            scriptId: '' as Protocol.Runtime.ScriptId,
             scriptHash: '',
             lineNumber,
             columnNumber,
@@ -894,7 +892,7 @@ export class ModelBreakpoint {
         return this.#debuggerModel.setBreakpointByURL(pos.url, pos.lineNumber, pos.columnNumber, condition);
       }
       return this.#debuggerModel.setBreakpointInAnonymousScript(
-          pos.scriptId, pos.scriptHash as string, pos.lineNumber, pos.columnNumber, condition);
+          pos.scriptHash as string, pos.lineNumber, pos.columnNumber, condition);
     }));
     const breakpointIds: Protocol.Debugger.BreakpointId[] = [];
     let locations: SDK.DebuggerModel.Location[] = [];
@@ -983,7 +981,6 @@ export class ModelBreakpoint {
 
 interface Position {
   url: Platform.DevToolsPath.UrlString;
-  scriptId: Protocol.Runtime.ScriptId;
   scriptHash: string;
   lineNumber: number;
   columnNumber?: number;
@@ -1015,9 +1012,6 @@ export namespace Breakpoint {
         if (positionA.url !== positionB.url) {
           return false;
         }
-        if (positionA.scriptId !== positionB.scriptId) {
-          return false;
-        }
         if (positionA.scriptHash !== positionB.scriptHash) {
           return false;
         }
diff --git a/test/unittests/front_end/models/bindings/BreakpointManager_test.ts b/test/unittests/front_end/models/bindings/BreakpointManager_test.ts
index f3164b77af..1c8ba836ed 100644
--- a/test/unittests/front_end/models/bindings/BreakpointManager_test.ts
+++ b/test/unittests/front_end/models/bindings/BreakpointManager_test.ts
@@ -158,7 +158,7 @@ describeWithRealConnection('BreakpointManager', () => {
     await breakpointManager.restoreBreakpointsForScript(script);
     assertNotNullOrUndefined(modelBreakpoint.currentState);
     assert.lengthOf(modelBreakpoint.currentState.positions, 1);
-    assert.strictEqual(modelBreakpoint.currentState.positions[0].scriptId, SCRIPT_ID);
+    assert.strictEqual(modelBreakpoint.currentState.positions[0].url, URL);
 
     // Clean up.
     await breakpoint.remove(false);
@@ -228,7 +228,7 @@ describeWithRealConnection('BreakpointManager', () => {
     await breakpointManager.restoreBreakpointsForScript(script);
     assertNotNullOrUndefined(modelBreakpoint.currentState);
     assert.lengthOf(modelBreakpoint.currentState.positions, 1);
-    assert.strictEqual(modelBreakpoint.currentState.positions[0].scriptId, SCRIPT_ID);
+    assert.strictEqual(modelBreakpoint.currentState.positions[0].url, URL);
 
     // Clean up.
     await breakpoint.remove(false);