It's in testing, If this is not helpful let me know.
[xxxxx@carlos ~]$ firedragon
XPCOMGlueLoad error for file /usr/lib/firedragon/libxul.so:
libvpx.so.6: cannot open shared object file: No such file or directory
Couldn't load XPCOM.
[xxxxx@carlos ~]$ pacman -Qi libvpx
Name : libvpx
Version : 1.11.0-1
Description : VP8 and VP9 codec
Architecture : x86_64
URL : https://www.webmproject.org/
Licenses : BSD
Groups : None
Provides : libvpx.so=7-64
Depends On : gcc-libs
Optional Deps : None
Required By : ffmpeg firedragon gst-plugins-good qt5-webengine thunderbird
Optional For : vlc
Conflicts With : None
Replaces : None
Installed Size : 4.46 MiB
Packager : Maxime Gauduin <[email protected]>
Build Date : Tue 12 Oct 2021 05:04:26 AM EDT
Install Date : Wed 20 Oct 2021 05:36:32 AM EDT
Install Reason : Installed as a dependency for another package
Install Script : No
Validated By : Signature