STR

1. Open browser toolbox (Ctrl+Shift+Alt+I)
2. Open a tab that has an overflowing view, e.g., open a long stylesheet in the style editor.
3. Click and drag the scrollbar thumb...
4. Without releasing the left mouse button, move your mouse cursor out of the window's bounds. For example if you're viewing a stylesheet the scrollbar is on the right edge of the window, so you can just move your mouse cursor a few pixels to the right.
5. With the mouse cursor out of the window's bounds, release the left mouse button.
6. Move your mouse cursor back into the window bounds.

Expected

Nothing should happen from here, the scrollbar should no longer be active.

Actual

The scrollbar continues to be dragged up and down with the mouse cursor, even though no button is being held. It does not stop dragging until you left click again. This makes some scrollbars pretty difficult and frustrating to use — many of them are so close to the window's edge that this happens very frequently, at least for me.

Thank you for the report!

I can reproduce the problem on my machine (Win10, Firefox Nightly)

Honza

The severity field is not set for this bug.
:Honza, could you have a look please?

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