Not able to follow project with Firefox 60.3.0esr

When I click on the “Follow project” button on the “Add Projects” page I get the following error:

Rollbaring: Error in AddProjectButton
Error: Was not able to successfully follow
Stack trace:
o/<@https://dmmj3mmt94rvw.cloudfront.net/assets/js/frontend-production-282e774f1139c0e6fa0deaa574634e03.js:8919:146802
 rollbar-4fcef5ccc29985d4878f2e7c5676180b.min.js:2:19646

Browser used: Firefox 60.3.0esr

Works fine in latest Google Chrome browser.