Yeah, it's working OK for me now. It was not working for a few hours that day. I think restarting my Firefox was the fix. Sometimes setting it to "work offline" and then going back online clears it faster without me needing to reload all of my tabs.
The DNS for gmail.fr is currently experiencing problems in some regions of the world.
It appears to be a DNS problem impacting many domains within .fr
In the meantime, if this is really a domain used by some international Gmail users, Gmail.fr users may be able to get their email using the Gmail.com settings.
Can anyone confirm if this is a real Gmail domain, and if that the fix works?