diff --git a/tfjs-backend-wasm/karma.conf.js b/tfjs-backend-wasm/karma.conf.js
index fb879c7ea15..35525890639 100644
--- a/tfjs-backend-wasm/karma.conf.js
+++ b/tfjs-backend-wasm/karma.conf.js
@@ -105,7 +105,7 @@ module.exports = function(config) {
     reportSlowerThan: 500,
     browserNoActivityTimeout: 3e5,
     browserDisconnectTimeout: 3e5,
-    browserDisconnectTolerance: 0,
+    browserDisconnectTolerance: 3,
     browserSocketTimeout: 1.2e5,
     customLaunchers: {
       // For browserstack configs see:
diff --git a/tfjs-backend-webgl/karma.conf.js b/tfjs-backend-webgl/karma.conf.js
index 9ff97557158..d27d5492165 100644
--- a/tfjs-backend-webgl/karma.conf.js
+++ b/tfjs-backend-webgl/karma.conf.js
@@ -96,7 +96,7 @@ module.exports = function(config) {
     reportSlowerThan: 500,
     browserNoActivityTimeout: 3e5,
     browserDisconnectTimeout: 3e5,
-    browserDisconnectTolerance: 0,
+    browserDisconnectTolerance: 3,
     browserSocketTimeout: 1.2e5,
     customLaunchers: {
       // For browserstack configs see:
diff --git a/tfjs-core/karma.conf.js b/tfjs-core/karma.conf.js
index 65129cb8137..fc9c7228a9a 100644
--- a/tfjs-core/karma.conf.js
+++ b/tfjs-core/karma.conf.js
@@ -108,7 +108,7 @@ module.exports = function(config) {
     reportSlowerThan: 500,
     browserNoActivityTimeout: 3e5,
     browserDisconnectTimeout: 3e5,
-    browserDisconnectTolerance: 0,
+    browserDisconnectTolerance: 3,
     browserSocketTimeout: 1.2e5,
     customLaunchers: {
       // For browserstack configs see: