Thank you for your answers
Atn Doitsu :
When links are created "manually" in Sigil, they look like :
<p class="note"><a id="ftn1" class="noteSymbol" href="../Text…
( the id="ftn…" after the <a )
Don't you think it could be a good thing that Footnote linker puts the id in the same position as when it is done manually ?
Thank you