Hi. I recently updated WordPress / Divi Theme and plugins on my site and getting exact same issues with PayPal buttons on FireFox and Chrome. (Not sure if linked to updates), but this is a total pain in the butt for all same reasons you state above. I use 'SSL Insecure Content Fixer', together with Really Simple SSL plug-ins, but these don't work anymore (mixed content flags on several pages, specifically Shop page). Wondering whether to use Divi buttons instead of PayPal which link to PayPal account instead? Surprised not to see more posts about this major issue (on general search) or any other replies to your post! Did you resolve this?
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