STEPS TO REPRODUCE: 1. Visit Facebook.com 2. Select Resources Tab 3. Click on multiple resources that have enough details to overflow in the Resource details sidebar. 4. Scroll to the bottom of details sidebar 5. Click back and then forward EXPECTED: Scroll position of details sidebar should be restored ACTUAL: Scroll position is reset to the top. REGRESSION: I don't think this ever worked. <https://bugs.webkit.org/show_bug.cgi?id=145591> fixed this for content view and navigation sidebar, but not the details sidebar(?).