Logged onto my friends Facebook account..?

[Giggle Buns]

So my friend left her Facebook logged in on my phone an she said I can go on it and message people or whatever I want so I wanted look at her messages to this guy, I know she doesn't care but I still worry if she notices I go through them so I wanted to know if she is logged onto her Facebook on another device, will she be able to see that I am going through stuff on her Facebook on my
Phone? Like if I went onto messages would it open the messages tab on her phone? Please help!
Thankssss

[Annika]

Just stop going on her Facebook. You have your own.

[nicevest954]

I promise you it won't open up tabs. So dont worry.