Q: I accidentally delete all my safari sessions

To regain your bookmarks, use your Time Machine backup.

To delete MacKeeper follow these steps:

How to uninstall MacKeeper – updated (from Apple Help Writer):

And never, ever install any similar software. Your Mac doesn't need it.

<Edited by Host>

Wondering what was <Edited by Host>?

No way to get it back.

Safari – Popup takes over

Safari – Popup takes over (2)

Popup remover – Scam Zapper

If the pop-up reloads, force quit Safari (command - option/alt - esc) and reopen with the shift key held down. If that doesn't work, disconnect from the Internet, go to Safari/History and delete the website. Quit and reopen with the shift key held down.

Without a backup, there is no way to recover the data.