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.

Tree style tabs convert. It works great, the only issue losing it one star is that it is tricky to see what tab you are on most of the time as it doesn't stand out enough.

Love it, wonderful for Tab grouping and saving

One of the best tools to manage tabs, bookmarkers and most everyday need related to web.

I can have four million tabs and still be organized.

Great addon, I just wish it would work in private mode, without needing to hit F1 to make it show.

Great addon to save yourself the headache of figuring out how to split firefox into multiple windows on start across your workspaces or multiple instances.

Awesome organizing addon, lots of options to set it up perfectly to overcome what Firefox lacks. Recently coming from the Chromium world after a long journey there, I forgot how underdeveloped Firefox can be, but addons like this are here to fix that and more, make it even better. Great job!