Wallet restore with Yoroi wallet extension

Since i have problems with Brave, i wanted to uninstall and reinstall it, as well as Yoroi wallet extension, but before doing so i tried to do the wallet restore on another computer.
In this attempt, I then entered the 15 words for recovery and then this screen appeared:


of the three addresses I only know the first one, where I have all my ADAs inside. Why are there also the addresses of Byron and ITN wallets? However, the respective addresses do not seem to me to have ever seen them before.

Last question. Is it possible to have two browsers with yoroi wallet extension that control the same shelley wallet?