I cannot download anything. I cannot install ANY extension. uBlock extension. The only thing that works with so called third-party content -> onto my PC is `save-as`. I am struggling with this for more than a few hours and have tried EVERYTHING. I mean LITERALY EVERYTHING that can be found regarding this. Chromium browser works normally. Have tried with default firefox-esr that ships with debian, and with Quantum 65 (current) version. Not a single change. I am using Debian (stable) Stretch, and no it is not firewall issue nor it is connection (proxy setup) issue, I strongly believe. Like I said, chromium just - works and I don't have sympathy for chromium nor I would like to gain some. I am not even unable to upload an images of the issues I am experiencing. "Uploading "test_download_file.png"..." ... for more than a 10 minutes.