To work with PayPal self-registrations, we need an English version of the Mozilla browser, it is simple and easy to use. The link to the browser and the import of cookies are below.
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How to disable WebRTC in Firefox:
Enter "about:config" in your address line and press Enter
In "Search" input type "media.peerconnection.enabled" and double click on the found setting, so it will turn to "false".