I would like to propose the addition of a persistent secondary web panel, similar to Microsoft Edge’s Side Panel. This would allow users to load full web pages inside a dedicated, docked panel on the right (or left) side of the browser window, without replacing the active tab.
Unlike a traditional sidebar (bookmarks, history, etc.), this panel would render actual web content in parallel with the main browsing area. If implemented as an optional and toggleable feature, it would not disrupt existing workflows. Users who prefer a minimal interface could leave it disabled.
I see this feature being used as a persistent “utility surface” running alongside the primary browsing area. The key idea is that the main tab remains the primary context, while the side panel provides always-available tools that support the task the user is currently doing.
In Microsoft Edge, this functionality is implemented natively through the built-in Side Panel, which allows users to pin web apps and keep them persistently docked alongside the main browsing area. I'll attach a short video demonstrating how Edge handles this interaction.
In Firefox, this has been achieved through custom scripts and configuration-based workarounds. For example:[https://github.com/aminought/firefox-second-sidebar](https://)
