Many have a reset feature to remove addons and reset the browser to stock.
In the meantime, try Control+W to close a page.
The "x" has been removed from the upper right corner of the
websites so I can't click the x to leave the page like I normally
did. Also, the three dots in the upper right corner are gone so I
can't click on those dots to pin things to my main screen.
Thank you,
bestnews

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic