It's very different from Chinese, Japanese or American debt because most of it is in their own currency. Their governments issue debt in their own currency (dollars, yen, yuan). That means they can always, in theory, create more of their own money to pay off obligations. Although it comes with risks that it can either create inflation/currency devauluation
but because France much like Greece uses the Euro they have no monetary control over it because it's a currency they don't print , the European Central Bank does, which makes it structurally similar to a debt in a foreign currency. So they can't print more money or raise or lower interest rates to manage it.
It wont collapse because EU wont let it but life will become more painful because of austerity(spending cuts) which means less education, health care, subsidies or pension support. They will pull back investments into social programs and infrastructure. It will probably lead to mass unemployment from the Public sector.
Taxes are high and it will skyrocket which will slash household spendings and business profits.
As interest rates rise from borrowing costs , credits will become more expensive for businesses and households to borrow and it will spill over into the housing markets.
To put it simply France it's going to have hard time and it will create market fall outs and ripple effects.
These two videos are good if you want to understand the debt crisis France in and what it implies: