On CrossOver 17 and greater, the simplest solution to fix this issue is to run: /path/to/cxoffice/bin/cxfix missinggstreamer1bad missinggstreamer1bad.amd64
Or add --show-all to see how CrossOver would fix it on your platform and others.
Alternatively you may try one of the commands below.
The commands usually also apply to derived distributions. So for instance a fix for Debian is typically also applicable to Ubuntu, Linux Mint, Deepin and Pop! OS. Similarly a fix for Fedora likely also works on Red Hat Enterprise Linux, CentOS, etc.
(1) Before Debian 11 the package containing the 32-bit plugins is incompatible with the 64-bit one. This also impacts the derived distributions such as Ubuntu, Pop OS!, etc. On affected distributions you will have to choose between the 32-bit plugins (for 32-bit Windows applications) and the 64-bit plugins (for your Linux applications such as Firefox).
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