Trying to create a fillable form which has a signature field that recepients must sign before submitting. However, for some recipients (who may not have Acrobat reader installed) , the PDF opens in their web browser by default. In the web browser, the signature field does not work. So my question is is there anything I can do to make it so the signature field is operational in any browser? or is their a way to make it so that it does not open in a browser, but promps them to download acrobat reader to open the form.
The only thing you can do is complain to the developers of these browsers
and inform your users not to open the files in them.