The Trademark Electronic Application System (TEAS) is a web-based application that works with most common internet browsers to include the latest versions of Microsoft Edge, Internet Explorer (IE), FireFox, Safari, and Google Chrome.
While the USPTO does not specifically endorse these web browser products, these are the browsers that support various TEAS features, namely, frames, JavaScript, SSLv3, TLSv1, and file upload. If your browser does not meet, or exceed the required standards, you may acquire these web browsers at:
Note: The Response to Post-Registration Office Action form is no longer supported on Internet Explorer. Use of Internet Explorer will cause the form to not function as expected and may lead to filing errors.
Steps to enable JavaScript
How to enable JavaScript in Microsoft Internet Explorer
How to enable JavaScript in Safari