I created a simple CSS extension to expose a scrollbar in the tab browser: https://addons.mozilla.org/addon/tab-bar-slider/. However, I find that when I try to click on the scrollbar or drag the slider, the clicks are ignored and I end up dragging the entire window. My best guess is that this has something to do with click-through behavior. When I open up the browser toolbox I notice that the scrollbar in question has an attribute “clickthrough=always”; however when I change it to “never,” nothing changes. Any ideas? Thanks.
