Please add an optional visible drag area to the Firefox toolbar.
When many tabs, extensions, buttons, and sidebars are enabled, it can become difficult to see where the browser window can still be grabbed and moved with the mouse. This is especially noticeable on ultrawide monitors or with a crowded toolbar.
A simple optional visual marker would help a lot, for example a small colored strip or highlighted area that shows: “You can drag the window here.”
Possible options:
This would improve usability without changing the main browser behavior.