TS wrote:... For my opinion it in an unsafe option to link Ebay and Paypal ...
I have mine linked

, and so does a good friend of mine who's a programmer and has worked for IBM in that capacity for years, but my wife refuses to do it. Actually, she's the person who discovered the NoScript problem.
To get back to the long details of what's going on, besides the options (1) having the EBay and PayPal accounts linked (when there's no NoScript problem), and (2) having them unlinked and using the standard EBay/PayPal checkout procedure (which involves clicking a button, having a popup window open, entering your PayPal username and password, and having yet another popup window open - which is where the NoScript problem occurs), there's a third option, where there's also no NoScript problem. (I'm sure screen shots would help here, but in order for the problem to occur, you have to purchase something via EBay, and at the moment, we don't need anything

).
Anyway, the third option is that at the moment when you're offered the "Pay via PayPal" button that opens the popups which initiate the problem, there's also a text-based option to the left of the button that says "Go directly to your PayPal account" or something like that. If you choose this, you bypass the popup windows and (I think) a new tab opens in which you're taken to the main PayPal page. Here you can log in with no problem.
So to summarize, the EBay/PayPal/NoScript problem ONLY occurs when the buyer doesn't have EBay and PayPal linked and chooses the "Pay via PayPal"
BUTTON option, which launches the two popup windows.
The first of these, in which you enter your email address and PayPal password, appears to work correctly: When you enter the required info and click OK, it launches a second popup window (which replaces the first) that has a spinner (activity indicator) that spins and shows you're waiting for your email address and PayPal password to be accepted by the PayPal login server.
At this point, the text "Logging into PayPal" (or something like this), which is in the middle of the second popup window (the first one is no longer visible), sort of slides up to the top of the new popup window, and the spinner (activity indicator) stays in the middle and just keeps spinning and spinning. This is the point where the problem occurs, i.e., NoScript is somehow breaking the PayPal login process between the time you enter your email address and password and the time the PayPal server tries to accept it.
I hope this makes things a bit clearer. The next time we buy anything, I'll try to remember to make some screenshots - or to film the process with my digital camera.
Oh, and just for the record, the problem began with Fx 52, but it's still present with the current beta, Fx 53, and with the Nightly, Fx 55.
Thanks for your follow-up Georgio.
Best regards,
Joe