If like me you are fed up with the cluttered interface of the main French train ticket website voyages-sncf.com, I advise you to try Capitaine Train, a startup that sells tickets too but re-invented the interface and is doing it right.
However, if you still want to use voyages-sncf.com for whatever reason, you can install this little hack I made by removing everything not necessary to me:
How to use it:
Install the Stylish add-on for Firefox or Chrome, then install my style from this page. Enjoy.
The simple “source code” is available on this gist, feel free to make it better.
This could be a message to SNCF: Keep It Simple Stupid, please.