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Reboot your Mac and see if the problem is cleared.

If rebooting your Mac doesn’t fix things, see if the problem still happens in Safe mode (hold the shift key down at startup). It can take much longer to safe boot (10 min) so be patient. You may need a wired USB keyboard for this.

How to use safe mode on your Mac - Apple Support 

Safe mode disables loading third-party drivers, forces the OS to clear certain caches and logs and does other miscellaneous housekeeping. It's non-destructive to user data so is safe to do. Very often certain weird software behavior is corrected by simply logging in this way as a troubleshooting method. When you're in safe boot, the machine will not be at its best performance, especially with graphics, but that's expected.

Does the problem persist while in Safe mode?

Exit safe mode by restarting your Mac normally and re-evaluate the issue again.

Two independent devices having trouble with websites indicate that you may have a problem with the internet connection.

You can try resetting your internet modem/router.

• Shut down any devices that connect to the router; your Mac, tablet, iPhone and printer (?).

• Turn the router off and disconnect the internet coax cable (the one that connects the router to your internet provider). Wait 30 seconds and then reconnect the coax cable and turn the router back on. Wait until the status lights that indicate service connection or link have calmed - usually a minute or two.

• Reboot your computer and ensure that it reconnects to the router and internet.

• Reboot your tablet your iPhone and printer and check their connections to the router and computer.

• Reevaluate your Mac's connection to the problem websites.