Fear not, of course your TV will work in France
It won't work on terrestrials unless it is SECAM compatible. If purchased outside France it is unlikely to be SECAM compatible.
- it is not a backward country.
Debatable but not germane to this thread.
Even your Freeview will work, but of course it will be French Freeview (called TNT), but you will have to use a terrestrial antenna which will have to be up to current digital standards.
It won't.