Floorp, a Firefox Fork with an awful name, has moved some components inside a private submodule.
github.com
See also https://forum.endeavouros.com/t/floorp-going-closed-source/52783
Edit: They claim they will make that part open source too, eventually, and it is due to behavior of another browser: https://github.com/Floorp-Projects/Floorp-core/issues/62
Edit 2: They just open sourced the private repository 7 minutes ago, 2024-03-24T12:39Z
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Curious, do you have some extension that makes Firefox support #:~:text?
Did the link not work for you?
The link always works but doesn't navigate to the text fragment. Not until October's Firefox 131, at least.