Though the idea is good, the functionalities need to be totally reviewed. As other reviewers said earlier,
1) "Just opens 2 normal tabs", without any split screen
2) "You need to paste two urls in a small widget which disappears when you go elsewhere to copy the addresses".

It just opens 2 normal tabs that you switch between like any others manually, nothing "split screen" about this.

This is the dumbest addon on the planet lmao.
You need to paste two urls in a small widget which disappears when you go elsewhere to copy the addresses.

Il faut c/c les adresses des deux sites à "split-screener" dans une petite fenêtre, laquelle disparaît lorsque l'on navigue. Donc pénible à utiliser, il faut garder deux adresses en presse papier. Dommage, l'idée est bonne et curieusement absente des fonctionnalités de base des navigateurs.