Allow arbitrary extensions in sidebar and ability to configure themselves to open on top or to the side of webpages

[n9]

Hello, extensions like ublock origin have overlay UI that opens on click and does not support opening like a sidebar element I assume, so these are not available in the vertical tabs sidebar menu. It makes sense for some extensions to open like a sidebar element/to the side of webpage and for some extensions to open like an overlay/on top of the webpage. So allowing this as well as to change extensions displayed in the sidebar would work great.

For example, you want a bookmark manager to open to the side of the webpage so the links you drag and drop into it aren't hidden by UI, whereas for adbockers and such, it makes sense to open as overlay instead of to the side. Throwing these extensions to the sidebar makes the addressbar look cleaner imho lol

[Jon]

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