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Hello astrella72 ,
I did test your form in firefox and I am able to replicate the issue you are having.
I have fixed this issue in your form by setting the "Vertical Padding" & "Textbox Height" to 3 and 32 respectively. Please check the screenshot below:
Now your form works as expected in the firefox browser. I was able to input in the name and email text boxes. Please check the screenshot below:
Do test your form and get back to us if the issue persists.
It's solved now :)
Thank you very much!!!