Increase the browser inactivity timeout

Increase the inactivity timeout when running
CI tests in case as recommended at
https://docs.travis-ci.com/user/gui-and-headless-browsers/#Karma-and-Firefox-inactivity-timeouts

That guidance applies to Travis but also to Sauce Labs.

Author: robertknight

karma-tests/karma.conf.js

@@ -91,9 +91,12 @@ module.exports = function(config) {
     sauceLabs: sauceLabsConfig,
 
     // use an extended timeout for capturing Sauce Labs
-    // browsers in case the service is busy
+    // browsers and waiting for activity
+    // in case the service is busy
     captureTimeout: 3 * 60000,
 
+    browserNoActivityTimeout: 30 * 1000,
+
     customLaunchers: customLaunchers,
 
     browsers: Object.keys(customLaunchers),