On two occasions I have made a purchase on two separate sites, the last one being comms-express.com. I chose Paypal as my payment option and when the Paypal login screen popup appeared, it remained blank. This remained the case despite enabling compatibility mode and disabling privacy shield.
I switched to Brave and made the purchase, paying through PayPal without issue.
I expect the Paypal popup to allow me to log into my PayPal account and authorise payment.
Orion Version 0.99.135.2-rc (WebKit 622.1.15.19.2), MacOS 15.6.1
Sequoia (15)