Dual Sidebar (Brave-like)

[frandmb]

What feature would you like to see?

Brave browser features a sidebar that's placed at the opposite side of the vertical tabs (although it can be configured to be next to them, on the same side). It uses the same length as collapsed vertical tabs

It could hold:

• Clickable Toggles for Firefox/Zen sidebar sections -which include history/bookmarks and some extensions-, which could, in the future, include the upcoming AI Services
  
• Docking space for toolbar's items, the ones that can be added through the "Customize toolbar" view. Including shortcuts for navigation, some extensions, devtools and screenshots.
• ???

[zenwav]

I'd like to second this proposal. Many extensions and web apps integrate well with a sidebar, and implementing one would significantly enhance the user experience.

For instance, I use Raindrop.io for bookmark management. Having a sidebar icon that opens the Raindrop.io interface directly in a side panel, without needing to navigate to a separate webpage, would streamline my workflow considerably.