Firefox added containers to compartmentalise web browsing. A smart individual took that concept and made an add-on to containerise the abomination known as Facebook.
Today, I found that another person took that idea and made one to corral Twitter and I had the idea to see if the same has been done for Google. It has.
Those 3 add-ons should go a way to keeping data leakage under control. Of course, augmenting your browser with uMatrix and uBlock Origin is thoroughly recommended for further hardening.