Thoughtful extension with one major flaw. After using Sidebery for about a year, I would say it is really quite helpful in my daily workflow. Standout features include clicking on the current tab to switch to the next–most recent tab, tab panels for better organization, and a huge list of settings to customize its look and behavior.

The one major flaw is that in every panel except my main one, the tabs occasionally get shifted to the last panel with their order reversed. This is quite frustrating and partially defeats the purpose of having multiple panels. This occurs randomly every few weeks.