diff --git a/.vscode/launch.json b/.vscode/launch.json
index 2de8b0414..210866ff4 100644
--- a/.vscode/launch.json
+++ b/.vscode/launch.json
@@ -102,8 +102,8 @@
     },
 		{
 			"name": "Run Tests",
-			"type": "extensionHost",
-			"request": "launch",
+			"type": "pwa-extensionHost",
+      "request": "launch",
       "runtimeExecutable": "${execPath}",
       "skipFiles": ["<node_internals>/**"],
 			"args": [
diff --git a/package-lock.json b/package-lock.json
index 068a7a29e..b33f8a0c5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -744,12 +744,6 @@
       "integrity": "sha512-FwI9gX75FgVBJ7ywgnq/P7tw+/o1GUbtP0KzbtusLigAOgIgNISRK0ZPl4qertvXSIE8YbsVJueQ90cDt9YYyw==",
       "dev": true
     },
-    "@types/mime-types": {
-      "version": "2.1.0",
-      "resolved": "https://registry.npmjs.org/@types/mime-types/-/mime-types-2.1.0.tgz",
-      "integrity": "sha1-nKUs2jY/aZxpRmwqbM2q2RPqenM=",
-      "dev": true
-    },
     "@types/minimatch": {
       "version": "3.0.3",
       "resolved": "https://registry.npmjs.org/@types/minimatch/-/minimatch-3.0.3.tgz",
@@ -789,15 +783,6 @@
       "integrity": "sha512-//oorEZjL6sbPcKUaCdIGlIUeH26mgzimjBB77G6XRgnDl/L5wOnpyBGRe/Mmf5CVW3PwEBE1NjiMZ/ssFh4wA==",
       "dev": true
     },
-    "@types/puppeteer": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/@types/puppeteer/-/puppeteer-2.0.1.tgz",
-      "integrity": "sha512-G8vEyU83Bios+dzs+DZGpAirDmMqRhfFBJCkFrg+A5+6n5EPPHxwBLImJto3qjh0mrBXbLBCyuahhhtTrAfR5g==",
-      "dev": true,
-      "requires": {
-        "@types/node": "*"
-      }
-    },
     "@types/qs": {
       "version": "6.9.1",
       "resolved": "https://registry.npmjs.org/@types/qs/-/qs-6.9.1.tgz",
@@ -1177,12 +1162,6 @@
       "integrity": "sha512-HiUX/+K2YpkpJ+SzBffkM/AQ2YE03S0U1kjTLVpoJdhZMOWy8qvXVN9JdLqv2QsaQ6MPYQIuNmwD8zOiYUofLQ==",
       "dev": true
     },
-    "agent-base": {
-      "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-5.1.1.tgz",
-      "integrity": "sha512-TMeqbNl2fMW0nMjTEPOwe3J/PRFP4vqeoNuQMG0HlMrtm5QxKqdvAkZ1pRBQ/ulIyDD5Yq0nJ7YbdD8ey0TO3g==",
-      "dev": true
-    },
     "aggregate-error": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.0.1.tgz",
@@ -5665,16 +5644,6 @@
       "integrity": "sha1-7AbBDgo0wPL68Zn3/X/Hj//QPHM=",
       "dev": true
     },
-    "https-proxy-agent": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-4.0.0.tgz",
-      "integrity": "sha512-zoDhWrkR3of1l9QAL8/scJZyLu8j/gBkcwcaQOZh7Gyh/+uJQzGVETdgT30akuwkpL8HTRfssqI3BZuV18teDg==",
-      "dev": true,
-      "requires": {
-        "agent-base": "5",
-        "debug": "4"
-      }
-    },
     "human-signals": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/human-signals/-/human-signals-1.1.1.tgz",
@@ -6409,6 +6378,12 @@
         "textextensions": "2"
       }
     },
+    "jpeg-js": {
+      "version": "0.3.7",
+      "resolved": "https://registry.npmjs.org/jpeg-js/-/jpeg-js-0.3.7.tgz",
+      "integrity": "sha512-9IXdWudL61npZjvLuVe/ktHiA41iE8qFyLB+4VDTblEsWBzeg8WQTlktdUK4CdncUqtUgUg0bbOmTE2bKBKaBQ==",
+      "dev": true
+    },
     "js-beautify": {
       "version": "1.11.0",
       "resolved": "https://registry.npmjs.org/js-beautify/-/js-beautify-1.11.0.tgz",
@@ -9023,6 +8998,82 @@
         }
       }
     },
+    "playwright": {
+      "version": "0.12.1",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-0.12.1.tgz",
+      "integrity": "sha512-icF4+I8y7A5HjhbTsa4Eqtl2fuGe3ECvW0Wrn6aRM5eL5/AqUIgIf2U/0e1S1bEsDfz1JVvClGl5Gqw4aI5H4w==",
+      "dev": true,
+      "requires": {
+        "playwright-core": "=0.12.1"
+      }
+    },
+    "playwright-core": {
+      "version": "0.12.1",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-0.12.1.tgz",
+      "integrity": "sha512-NZ8Qe/kqsgAmFBxWZnUeE+MoZ04UzNI0DHOKA+I1p/5rbpaWhe1Vx5zVNa05A1iEvOtnKV1PdIEe4IPumG2y2w==",
+      "dev": true,
+      "requires": {
+        "debug": "^4.1.0",
+        "extract-zip": "^1.6.6",
+        "https-proxy-agent": "^3.0.0",
+        "jpeg-js": "^0.3.6",
+        "pngjs": "^3.4.0",
+        "progress": "^2.0.3",
+        "proxy-from-env": "^1.1.0",
+        "rimraf": "^3.0.2",
+        "ws": "^6.1.0"
+      },
+      "dependencies": {
+        "agent-base": {
+          "version": "4.3.0",
+          "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-4.3.0.tgz",
+          "integrity": "sha512-salcGninV0nPrwpGNn4VTXBb1SOuXQBiqbrNXoeizJsHrsL6ERFM2Ne3JUSBWRE6aeNJI2ROP/WEEIDUiDe3cg==",
+          "dev": true,
+          "requires": {
+            "es6-promisify": "^5.0.0"
+          }
+        },
+        "https-proxy-agent": {
+          "version": "3.0.1",
+          "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-3.0.1.tgz",
+          "integrity": "sha512-+ML2Rbh6DAuee7d07tYGEKOEi2voWPUGan+ExdPbPW6Z3svq+JCqr0v8WmKPOkz1vOVykPCBSuobe7G8GJUtVg==",
+          "dev": true,
+          "requires": {
+            "agent-base": "^4.3.0",
+            "debug": "^3.1.0"
+          },
+          "dependencies": {
+            "debug": {
+              "version": "3.2.6",
+              "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
+              "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
+              "dev": true,
+              "requires": {
+                "ms": "^2.1.1"
+              }
+            }
+          }
+        },
+        "rimraf": {
+          "version": "3.0.2",
+          "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
+          "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+          "dev": true,
+          "requires": {
+            "glob": "^7.1.3"
+          }
+        },
+        "ws": {
+          "version": "6.2.1",
+          "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
+          "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
+          "dev": true,
+          "requires": {
+            "async-limiter": "~1.0.0"
+          }
+        }
+      }
+    },
     "please-upgrade-node": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/please-upgrade-node/-/please-upgrade-node-3.2.0.tgz",
@@ -9044,6 +9095,12 @@
         "extend-shallow": "^3.0.2"
       }
     },
+    "pngjs": {
+      "version": "3.4.0",
+      "resolved": "https://registry.npmjs.org/pngjs/-/pngjs-3.4.0.tgz",
+      "integrity": "sha512-NCrCHhWmnQklfH4MtJMRjZ2a8c80qXeMlQMv2uVp9ISJMTt562SbGd6n2oq0PaPgKm7Z6pL9E2UlLIhC+SHL3w==",
+      "dev": true
+    },
     "posix-character-classes": {
       "version": "0.1.1",
       "resolved": "https://registry.npmjs.org/posix-character-classes/-/posix-character-classes-0.1.1.tgz",
@@ -9171,56 +9228,6 @@
       "integrity": "sha512-XRsRjdf+j5ml+y/6GKHPZbrF/8p2Yga0JPtdqTIY2Xe5ohJPD9saDJJLPvp9+NSBprVvevdXZybnj2cv8OEd0A==",
       "dev": true
     },
-    "puppeteer": {
-      "version": "2.1.1",
-      "resolved": "https://registry.npmjs.org/puppeteer/-/puppeteer-2.1.1.tgz",
-      "integrity": "sha512-LWzaDVQkk1EPiuYeTOj+CZRIjda4k2s5w4MK4xoH2+kgWV/SDlkYHmxatDdtYrciHUKSXTsGgPgPP8ILVdBsxg==",
-      "dev": true,
-      "requires": {
-        "@types/mime-types": "^2.1.0",
-        "debug": "^4.1.0",
-        "extract-zip": "^1.6.6",
-        "https-proxy-agent": "^4.0.0",
-        "mime": "^2.0.3",
-        "mime-types": "^2.1.25",
-        "progress": "^2.0.1",
-        "proxy-from-env": "^1.0.0",
-        "rimraf": "^2.6.1",
-        "ws": "^6.1.0"
-      },
-      "dependencies": {
-        "mime": {
-          "version": "2.4.4",
-          "resolved": "https://registry.npmjs.org/mime/-/mime-2.4.4.tgz",
-          "integrity": "sha512-LRxmNwziLPT828z+4YkNzloCFC2YM4wrB99k+AV5ZbEyfGNWfG8SO1FUXLmLDBSo89NrJZ4DIWeLjy1CHGhMGA==",
-          "dev": true
-        },
-        "mime-db": {
-          "version": "1.43.0",
-          "resolved": "https://registry.npmjs.org/mime-db/-/mime-db-1.43.0.tgz",
-          "integrity": "sha512-+5dsGEEovYbT8UY9yD7eE4XTc4UwJ1jBYlgaQQF38ENsKR3wj/8q8RFZrF9WIZpB2V1ArTVFUva8sAul1NzRzQ==",
-          "dev": true
-        },
-        "mime-types": {
-          "version": "2.1.26",
-          "resolved": "https://registry.npmjs.org/mime-types/-/mime-types-2.1.26.tgz",
-          "integrity": "sha512-01paPWYgLrkqAyrlDorC1uDwl2p3qZT7yl806vW7DvDoxwXi46jsjFbg+WdwotBIk6/MbEhO/dh5aZ5sNj/dWQ==",
-          "dev": true,
-          "requires": {
-            "mime-db": "1.43.0"
-          }
-        },
-        "ws": {
-          "version": "6.2.1",
-          "resolved": "https://registry.npmjs.org/ws/-/ws-6.2.1.tgz",
-          "integrity": "sha512-GIyAXC2cB7LjvpgMt9EKS2ldqr0MTrORaleiOno6TweZ6r3TKtoFQWay/2PceJ3RuBasOHzXNn5Lrw1X0bEjqA==",
-          "dev": true,
-          "requires": {
-            "async-limiter": "~1.0.0"
-          }
-        }
-      }
-    },
     "qs": {
       "version": "6.7.0",
       "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
diff --git a/package.json b/package.json
index bf9f21387..2a17a8c04 100644
--- a/package.json
+++ b/package.json
@@ -93,7 +93,6 @@
     "@types/mkdirp": "^1.0.0",
     "@types/mocha": "^7.0.2",
     "@types/node": "^13.11.0",
-    "@types/puppeteer": "^2.0.1",
     "@types/sinon": "^9.0.0",
     "@types/split2": "^2.1.6",
     "@types/stream-buffers": "^3.0.3",
@@ -128,8 +127,8 @@
     "mocha-multi-reporters": "^1.1.7",
     "npm-run-all": "^4.1.5",
     "nyc": "^15.0.1",
+    "playwright": "^0.12.1",
     "prettier": "^2.0.4",
-    "puppeteer": "^2.1.1",
     "sinon": "^9.0.1",
     "stream-buffers": "^3.0.2",
     "ts-node": "^8.8.2",
diff --git a/src/adapter/breakpoints/breakpointBase.ts b/src/adapter/breakpoints/breakpointBase.ts
index 25242d27a..dfdb0b2b6 100644
--- a/src/adapter/breakpoints/breakpointBase.ts
+++ b/src/adapter/breakpoints/breakpointBase.ts
@@ -380,8 +380,8 @@ export abstract class Breakpoint {
    * requests to avoid triggering any logpoint breakpoints multiple times,
    * as would happen if we set a breakpoint both by script and URL.
    */
-  private hasSetOnLocation(script: Partial<Script>, lineColumn: LineColumn): boolean {
-    return this.cdpBreakpoints.some(
+  private hasSetOnLocation(script: Partial<Script>, lineColumn: LineColumn) {
+    return this.cdpBreakpoints.find(
       bp =>
         (script.url &&
           isSetByUrl(bp.args) &&
@@ -396,7 +396,13 @@ export abstract class Breakpoint {
 
   private async _setByUrl(thread: Thread, url: string, lineColumn: LineColumn): Promise<void> {
     lineColumn = base1To0(lineColumn);
-    if (this.hasSetOnLocation({ url }, lineColumn)) {
+
+    const previous = this.hasSetOnLocation({ url }, lineColumn);
+    if (previous) {
+      if (previous.state === CdpReferenceState.Pending) {
+        await previous.done;
+      }
+
       return;
     }
 
@@ -415,7 +421,12 @@ export abstract class Breakpoint {
     lineColumn = base1To0(lineColumn);
 
     // Avoid setting duplicate breakpoints
-    if (this.hasSetOnLocation(script, lineColumn)) {
+    const previous = this.hasSetOnLocation(script, lineColumn);
+    if (previous) {
+      if (previous.state === CdpReferenceState.Pending) {
+        await previous.done;
+      }
+
       return;
     }
 
diff --git a/src/adapter/threads.ts b/src/adapter/threads.ts
index f989380d2..2d123d69c 100644
--- a/src/adapter/threads.ts
+++ b/src/adapter/threads.ts
@@ -414,7 +414,7 @@ export class Thread implements IVariableStoreDelegate {
 
     if (response.exceptionDetails) {
       const formattedException = await this._formatException(response.exceptionDetails);
-      throw new errors.ExternalError(formattedException.output);
+      throw new errors.ProtocolError(errors.replError(formattedException.output));
     } else {
       const contextName =
         this._selectedContext && this.defaultExecutionContext() !== this._selectedContext
diff --git a/src/binder.ts b/src/binder.ts
index facfb31f4..6fadb8cdc 100644
--- a/src/binder.ts
+++ b/src/binder.ts
@@ -150,7 +150,11 @@ export class Binder implements IDisposable {
   }
 
   private async _disconnect() {
-    await Promise.all([...this.getLaunchers()].map(l => l.disconnect()));
+    if (!this._launchers) {
+      return;
+    }
+
+    await Promise.all([...this._launchers].map(l => l.disconnect()));
 
     const didTerminate = () => !this.targetList.length && this._terminationCount === 0;
     if (didTerminate()) {
diff --git a/src/cdp/rawPipeTransport.ts b/src/cdp/rawPipeTransport.ts
index 14759745f..8c52edf40 100644
--- a/src/cdp/rawPipeTransport.ts
+++ b/src/cdp/rawPipeTransport.ts
@@ -33,13 +33,14 @@ export class RawPipeTransport implements ITransport {
     this.pipeRead?.destroy();
     this.streams.write.removeListener('end', this.onceEnded);
     this.streams.write.removeListener('error', this.onWriteError);
+    // Suppress pipe errors, e.g. EPIPE when pipe is destroyed with buffered data
+    this.streams.write.on('error', () => undefined);
     this.streams.write.end();
     this.streams = undefined;
     this.endEmitter.fire();
   });
 
   private readonly onWriteError = (error: Error) => {
-    // Suppress pipe errors, e.g. EPIPE when pipe is destroyed with buffered data
     this.logger.error(LogTag.Internal, 'pipeWrite error', { error });
   };
 
@@ -54,10 +55,10 @@ export class RawPipeTransport implements ITransport {
     const read = pipeRead || pipeWrite;
     this.streams = {
       read: read
+        .on('error', error => this.logger.error(LogTag.Internal, 'pipeRead error', { error }))
         .pipe(split('\0'))
         .on('data', json => this.messageEmitter.fire([json, process.hrtime.bigint()]))
-        .on('end', this.onceEnded)
-        .on('error', error => this.logger.error(LogTag.Internal, 'pipeRead error', { error })),
+        .on('end', this.onceEnded),
       write: pipeWrite.on('end', this.onceEnded).on('error', this.onWriteError),
     };
   }
diff --git a/src/dap/connection.ts b/src/dap/connection.ts
index 25d1a5423..f44d09331 100644
--- a/src/dap/connection.ts
+++ b/src/dap/connection.ts
@@ -6,7 +6,7 @@ import Dap from './api';
 
 import { ITelemetryReporter } from '../telemetry/telemetryReporter';
 import { ILogger } from '../common/logging';
-import { isDapError, isExternalError, ProtocolError } from './errors';
+import { isDapError, ProtocolError } from './errors';
 import { Message, IDapTransport } from './transport';
 import { IDisposable } from '../common/disposable';
 import { getDeferred } from '../common/promiseUtil';
@@ -159,7 +159,7 @@ export default class Connection {
       };
 
       try {
-        const callback = msg.command && this._requestHandlers.get(msg.command);
+        const callback = this._requestHandlers.get(msg.command);
         if (!callback) {
           console.error(`Unknown request: ${msg.command}`);
         } else {
@@ -184,10 +184,6 @@ export default class Connection {
           Number(process.hrtime.bigint() - receivedTime) / 1e6,
         );
       } catch (e) {
-        const format = isExternalError(e)
-          ? e.message
-          : `Error processing ${msg.command}: ${e.stack || e.message}`;
-
         if (e instanceof ProtocolError) {
           this._send({
             ...response,
@@ -202,7 +198,7 @@ export default class Connection {
             body: {
               error: {
                 id: 9221,
-                format,
+                format: `Error processing ${msg.command}: ${e.stack || e.message}`,
                 showUser: false,
                 sendTelemetry: false,
               },
diff --git a/src/dap/errors.ts b/src/dap/errors.ts
index eda79a70c..ca6729462 100644
--- a/src/dap/errors.ts
+++ b/src/dap/errors.ts
@@ -23,6 +23,7 @@ export const enum ErrorCodes {
   ProfileCaptureError,
   InvalidConcurrentProfile,
   InvalidBreakpointCondition,
+  ReplError,
 }
 
 export function reportToConsole(dap: Dap.Api, error: string) {
@@ -141,6 +142,8 @@ export const invalidConcurrentProfile = () =>
     ErrorCodes.InvalidConcurrentProfile,
   );
 
+export const replError = (message: string) => createSilentError(message, ErrorCodes.ReplError);
+
 export const browserNotFound = (
   browserType: string,
   requested: string,
@@ -198,14 +201,3 @@ export class ProtocolError extends Error {
  */
 export const isDapError = (value: unknown): value is Dap.Error =>
   typeof value === 'object' && !!value && '__errorMarker' in value;
-
-/**
- * Use this error to fail a request with an error that came from user code or the runtime.
- * The original stack will be preserved, instead of attaching the stack from debug adapter code.
- */
-export class ExternalError extends Error {
-  __externalError = true;
-}
-
-export const isExternalError = (value: unknown): value is ExternalError =>
-  typeof value === 'object' && !!value && '__externalError' in value;
diff --git a/src/test/test.ts b/src/test/test.ts
index 317c7b6e5..987426287 100644
--- a/src/test/test.ts
+++ b/src/test/test.ts
@@ -35,6 +35,7 @@ import { BrowserLauncher } from '../targets/browser/browserLauncher';
 import { StreamDapTransport } from '../dap/transport';
 import { tmpdir } from 'os';
 import { forceForwardSlashes } from '../common/pathUtils';
+import playwright from 'playwright';
 
 export const kStabilizeNames = ['id', 'threadId', 'sourceReference', 'variablesReference'];
 
@@ -303,7 +304,6 @@ export class NodeTestHandle implements ITestHandle {
 
   async load() {
     await this.dap.configurationDone({});
-    await this.dap.attach({});
   }
 }
 
@@ -428,6 +428,8 @@ export class TestRoot {
       rootPath: this._workspaceRoot,
       skipNavigateForTest: true,
       trace: { logFile: tmpLogPath },
+      runtimeExecutable:
+        process.platform === 'darwin' ? playwright.chromium.executablePath() : 'stable',
       outFiles: [`${this._workspaceRoot}/**/*.js`, '!**/node_modules/**'],
       ...options,
     } as AnyChromiumLaunchConfiguration);
@@ -579,6 +581,7 @@ export class TestRoot {
           cb();
         }
         this._root.dap.disconnect({});
+        this.binder.dispose();
       });
     });
   }
diff --git a/tsconfig.json b/tsconfig.json
index 6c9d20a19..1d7c580d9 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -13,6 +13,7 @@
     "alwaysStrict": true,
     "resolveJsonModule": true,
     "esModuleInterop": true,
+    "skipLibCheck": true,
     "types": ["node", "chai-subset", "mocha"]
   },
   "include": ["src"]