Stateful sidebar windows that persists after closing the sidebar

[papetoast]

This is a generalization of 

https://connect.mozilla.org/t5/ideas/sidebar-ai-chatbot-panel-resets-reloads-when-closed-and-reopene...

Because of the limitation that only one sidebar can be active, it is sometimes needed to switch between different sidebars. And as more extensions support using them on the sidebar I am increasingly frustrated that closing/switching the active sidebar item immediately kills the previous sidebar's state. For my workflow this means im effectively stuck to using ~1-2 extensions on the sidebar at most.

[Jon]

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[dulfried]

I recently switched from Vivaldi to Firefox and this is the one feature I truly miss. In Vivaldi, you can pin multiple web apps to the sidebar and switch between them instantly, because every panel stays loaded in memory. In Firefox, switching between sidebar panels immediately destroys the previous panel's document. I use the Telegram and TickTick extensions from semanticdata on github and the built-in chatbot feature and every time I switch between them, the inactive app fully reloads on return, and my zoom level is reset. This defeats the purpose of the sidebar for me.
Since the sidebar already supports multiple extensions and tools side by side, keeping inactive panels alive in the background (or at least preserving their session/state) would make it really productive to use. Vivaldi has proven this can work really well.