NopCommerce 4.2 PayPal SmartButtons and PayPal Standard buttons disappear when using Firefox

I have many customers who use FireFox. When they select PayPal payments the buttons load and then disappear.
1. I have been able to successfully recreate this as reported.
2. I have disabled popup blocker in FireFox
3. I have turned off all blocking & tracking in Firefox, same results
4. Cleared all cache in FireFox
I setup a breakpoint in FireFox web Dev and I get the following JS error for paypal sdk - which goes far beyond my knowledge level of JS. Any help of thoughts on how to resolve this would be greatly appreciated as I am losing sales, (I recently switched from Wordpress nopcommerce, where I used PayPal payments plugins without issues).

Error in FireFox Web Dev **********************************************************************************

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That's the actual error?  It looks like the entire minified JS.  

Were you able to set that breakpoint on the buttons before they disappeared?  This suggests that something, possibly a JS error in a different script, is triggering the .hide() event for the buttons:
https://github.com/paypal/paypal-checkout-components/issues/416

Thank you for the reply. Yea, I guess this shows how little I know. :-) The buttons appear\disappear in the blink of an eye, so I do not know how to set the breakpoint on the button itself. I read the post in link you sent and followed another from that post, which gave me the idea to try it without one page checkout enabled. When I disable it, the buttons render as expected in FireFox. However I prefer the one page checkout.  any thoughts as to why switching off one page checkout would change the paypal functionality?

techclmbr wrote:

One Page Checkout has its own JS in Nop.Web\wwwroot\js\public.onepagecheckout.js, so maybe that's where the conflict is.

Using the browser devtools, can you find the hidden PP button container in the DOM?  Then right-click their containing <div> and set "break on" to subtree modifications.  Click back then continue to reload the payment view and hopefully it breaks when they disappear.

Errors will be in the devtools console tab, the JS will break in the debugger tab.

Sorry, looks like that won't work because back/continue loses the breakpoint and a refresh starts checkout from the beginning.

What about going to onepagecheckout.js in the debugger tab and setting a breakpoint in PaymentMethod?  Hopefully the init breaks before paypal:

Ok, so after I re-enabled one page checkout, it works as expected in FireFox. Not sure why this would correct the conflict, but it seems to have worked! Do you think I should still run the breakpoint test or just go with the "if it ain't broken, don't fix it" plan?
Thank you so much for helping me out with this!

Well, if you were losing sales I'd imagine you'll sleep better knowing it won't unfix itself.  Is there a public URL for your store we can look at?

yes sir, yes I will!
As an FYI - exactly what I did was:
1.  disable the one page checkout (this worked on my initial try with FireFox, but after a successful test with Edge and Chrome and a refresh and retest with FireFox, I began getting a generic error page, an error has occurred, blah, blah, blah. I cleared the cache in the nopcommerce admin control panel and restarted the app, (in the control panel) and tried again with all three browsers, received a new error something about value to low/decimal point or something.
2. I reenabled the one page checkout
3. restarted the website in my Plesk control panel
4. cleared the cart of all items, and refreshed the page
5. added new items and tested on all three browsers and it worked.
I am running a pretty much plain v4.2 basic theme
site URL is: Https://Team-Tough.com
Thank you and would love to hear if you see anything that you feel I should change or do.

Cheers,

DQ

Cool climbing gear!

The Smart buttons loaded and work fine for me, but the Standard does not.  

I saw PayPal complaining a lot about not being able to post to its logger (CORS request blocked), but then I realized that was my UBlock Origin looking out for me.  After I disabled it there were no JS errors.

I believe that plugin sends the cart items to PP, do you remember which item was in your cart when you got it to fail?  

Also, do you have logs enabled?

And see if anything shows up in your PP dev account:
https://developer.paypal.com/developer/dashboard/webhooks/live/

techclmbr wrote:

We have already received a bug reports regarding this error in PayPal SmartButtons plugin. And fixed it (including for 4.20). What version of your plugin?