diff --git a/debug/src/devtools/custom.js b/debug/src/devtools/custom.js
index 6208b62fbb6..7133836cdeb 100644
--- a/debug/src/devtools/custom.js
+++ b/debug/src/devtools/custom.js
@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import { Component, Fragment } from 'preact';
 
 /**
diff --git a/debug/src/devtools/index.js b/debug/src/devtools/index.js
index 94348aab836..7539a8cf34a 100644
--- a/debug/src/devtools/index.js
+++ b/debug/src/devtools/index.js
@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import { options, Component, Fragment } from 'preact';
 import { Renderer } from './renderer';
 
diff --git a/debug/src/devtools/renderer.js b/debug/src/devtools/renderer.js
index 542eca8c152..02b57e8cb67 100644
--- a/debug/src/devtools/renderer.js
+++ b/debug/src/devtools/renderer.js
@@ -1,3 +1,4 @@
+/* istanbul ignore file */
 import { getData, getChildren, getInstance, hasDataChanged, isRoot } from './custom';
 
 /**
diff --git a/debug/test/browser/devtools.test.js b/debug/test/browser/devtools.test.js
index d088101a603..52cd781816b 100644
--- a/debug/test/browser/devtools.test.js
+++ b/debug/test/browser/devtools.test.js
@@ -137,7 +137,10 @@ function getRoot(element) {
 	return element._children;
 }
 
-describe('devtools', () => {
+const supported = /(Chrome)|(Firefox)[^(Edge)]/i.test(navigator.userAgent);
+const desc = supported ? describe : describe.skip;
+
+desc('devtools', () => {
 
 	/** @type {import('../../src/internal').PreactElement} */
 	let scratch;
diff --git a/karma.conf.js b/karma.conf.js
index 84547687fea..0a21d8c3196 100644
--- a/karma.conf.js
+++ b/karma.conf.js
@@ -9,6 +9,8 @@ var coverage = String(process.env.COVERAGE) === 'true',
 	webpack = require('webpack'),
 	path = require('path');
 
+sauceLabs = true;
+
 var sauceLabsLaunchers = {
 	sl_chrome: {
 		base: 'SauceLabs',