Supports FireFox/Floorp Browser Manager Sidebar?

[Basserra]

Is there a way to modify the panel width/padding to fit better in Browser Manager Sidebar (BMS)? The standard Sidebar is always the correct/dynamic width, but I want to use the BMS Web Panel/Sidebar for the extension buttons, and visually see the container color markers. In the screenshot both types of Sidebar are open, and the BMS one, on the left, covers nested tabs container marker and their close button [X]

I used to use some custom CSS to partially hide the Sidebar and 'pop-out' on mouse hover, but I'd rather have it fully hidden when not needed and don't want to use Ctrl+E every time. The 'pop-out' was annoying. I don't know nor like CSS much, but of course am willing to work with it

[Basserra]

Found a solution that seemingly gets me what I want. I pinned the extension to the toolbar then just threw it at the wall on the left. I still would like to know if that sizing dilemma could be fixed, but this works and still allows for most standard CSS edits I think.