Contact Form Working in Chrome but Inconsistent in Firefox – What Should I Check?

Hello everyone, We recently received feedback from a few users who reported issues when submitting forms through Firefox, while the same forms appear to work normally in Chrome and Edge. The website belongs to Avenue Billing Services, and the issue seems inconsistent. Some users can submit forms without any problems, while others experience submission failures or no response after clicking the submit button. So far, we have: • Tested the form in Chrome and Edge successfully • Verified basic form validation settings • Checked for server-side errors • Cleared browser cache and cookies Before diving deeper into debugging, I wanted to ask the community: • What are the most common causes of form submission issues that appear only in Firefox? • Are there any Firefox-specific settings, privacy features, or extensions that could interfere with form functionality? • What tools or methods do you recommend for troubleshooting browser-specific issues? Any suggestions or troubleshooting tips would be greatly appreciated. Thank you.