Pamac fails to build firefox-appmenu

4xx Client Error 417 Expectation Failed
3
  1. Building from source will take between half an hour and multiple hours, browsers are huge these days
  2. You will find the solution at the AUR page of firefox-appmenu by looking at the first, pinned comment
  3. There is firefox-appmenu-bin which is precompiled if you want to save time
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