I received some bogus page on my yahoo.finance page that accused me of visiting child pornographer sites, claiming to be the FBI and Interpol, and that they were going to lock down my computer unless I paid them $300. I could not switch from that window

anyone else have their computer momentarily freezed by some peddlers accusing you of pronoting pornagraphy and asking for $300 to release your files?

Some of those scam pages can be dismissed very easily. Press command-W to close the tab or window. A huge box will pop up. Press the return key and both the box and the page will close. If that doesn't happen, continue.
From the Safari menu bar, select
Safari ▹ Preferences... ▹ Security
and uncheck the box marked Enable JavaScript. Leave the preferences dialog open.
Close the malicious window or tab.
Re-enable JavaScript and close the preferences dialog.
If the Preferences menu item is grayed out, quit Safari. Force quit if necessary. Relaunch it by holding down the shift key and clicking its icon in the Dock. From the menu bar, select
Safari ▹ Preferences... ▹ Privacy ▹ Remove All Website Data
to get rid of any cookies or other data left by the server. Open your Downloads folder and delete anything you don't recognize.

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