The tiles on https://openstreetmap.org load fine in a private window and other browsers, but not in a regular Firefox browser tab. The developer tools show me that any images with a Content-Length larger than ~16KiB are loaded only up to ~16KiB. When I open the image in a new tab, it works at first, but if I hit ctrl+f5 then the issue occurs again. There are two headers added for requests that fail: Cache-Control: no-cache and Pragma: no-cache. In a private window, these headers are also present, but the issue is not. In Wireshark, I can see that after ~15KB the server sends some RST packets. But of course I don't know why as everything is encrypted. Since it doesn't happen in other browsers, another device, or even in private windows, though, I rather doubt that it's the server. I've tried the usual like turning off ad blocking, privacy badger, and decentraleyes. Screenshots are attached and the pcap can be found here: https://lucb1e.com/tmp/tile-rst.pcapng Any ideas? I'm at a loss what this could be. (PS. The "Share Data" button at the bottom of this submission page doesn't work and when you click the link that it gives for steps to obtain the troubleshooting information manually, it goes to a new page in the same tab. Going back, the post is gone. Good thing I thought to ctrl+c the message...)