Scroll to top and back 摘要
Scroll to top and back：Scroll to the top of the page by clicking on the browser action icon (or page action icon) and scroll to the previous position by clicking on it again..
fix scroll back to Youtube comments
Scroll to top and back 简介
To adapt the icon color to the browser theme color open about:config, find the preference svg.context-properties.content.enabled and change it to true. See bug #1377302.