@leocg The response of HTTP ERROR 403 (especially througth https) is sent from Opera site to the browser, not from any man-in-the-middle.
Latest posts made by JustTryRandomName
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Opera for WindowsRE: Access to addons.opera.com was denied , HTTP ERROR 403 (China IP)
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Opera for WindowsAccess to addons.opera.com was denied , HTTP ERROR 403 (China IP)
Opera extensions bans China users now?
Obviously it is not related to GFW, if you have basic knowledge about HTTP error code.