conflicting jquery issue

Hi,

I have installed contact form 7 datepicker, got integrateed into my form all well and good, however now everytime I come to visit the page this error appears in firefox:

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.

Script: http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js?ver=3.9.1:2.

After quite a bit of poking around I deactivate the plugin and the page loads how it should. Is there any way to resolve this?

There are two other plugins on this page, if that is any help.

Thanks in advance.

https://ww.wp.xz.cn/plugins/contact-form-7-datepicker/