yes it is.
however while the front national is very noisy and always in the news during elections they are never as sucessfull as our right wingers over here.
For example there are about 36000 mayor in France. Of those only 14, yes fourteen are held by the front national...
Now, because of the proportional system for the french and european assemblies they have around 30 to 40 reps, not enough to do anything of note because most major parties do not want to ally with them given how toxic they are.
This enable them however, to stay in the news and gin up their base. Lately because of brexit and us electing Trump, they have surged enough to end up at the second round of the elections. That in itself is shocking but I think that is pretty much all they can achieve.