You don't have to worry, this software is safe, I use it myself and I wouldn't mention it otherwise. It runs without installation, does not modify anything outside its own program folder, simply saves its configuration file ("ChromeHistoryView.cfg") in its own directory and does nothing else than read Opera's "History" file, which is a simple SQLite database file.

Your history data will also not be transferred to any third parties if this is your concern.

Is there a way to export "history" from Opera and add it on another browser?

ChromeHistoryView can export Opera's history in various file formats, including htm and xml. Since all web browsers can open these file types, you could make the Opera history available to them in this way.