Description

In Firefox, both in the editor and in the front end, footnote anchors are rendered as follows:

Step-by-step reproduction instructions

1. Using Firefox, start a new post
2. Add some footnotes
3. Observe their rendering

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes