I would like to thank everyone who tried to help me with my problem of not being able to sign in to certain websites. I finally (through trial an error) found the problem to my situation. I had downloaded an app called "Privacy Badger". It would let me sign in to some of my sites. I simply went to my puzzle piece at the top right of the screen. I started checking my apps, one at a time. Privacy Badger was the culprit. I simply turned it off. Everything is working fine.