This message is displayed if your operating system terminated the process on a browser tab (for example, because of insufficient memory). This message may also appear if you terminated a “frozen” process using the browser's task manager, the system task manager, or the command line interface.
Try refreshing the page. If this doesn't help, close any inactive tabs and unused programs in order to free up memory so the tab can continue working.
Crashes can be caused by malicious programs.
You can also type browser://conflicts in the SmartBox to view existing conflicts and find out whether there are other ways to remove the malware (available only on Windows).