Mixing of single and double quotes

Hi, I’ve got an issue with single and double quotes being output by the wpfp_link() function. This is breaking my JS function. An example of the output is:

<span class='wpfp-span'><img src="http://xxxxx.com/wp-content/plugins/wp-favorite-posts/img/star.png?99f5c3" alt='Favorite' title='Favorite' class='wpfp-img' /><img src="http://xxxxx.com/wp-content/plugins/wp-favorite-posts/img/loading.gif?99f5c3" alt='Loading' title='Loading' class='wpfp-hide wpfp-img' /><a class='wpfp-link' href='?wpfpaction=add&postid=3124411' title='Add to favorites' rel='nofollow'>Add to favorites</a></span>

Is there a way to escape single/double quotes?

https://wordpress.org/plugins/wp-favorite-posts/