Firefox 34.0.5 When using a large number of tabs, around 300 inactive and 30 active tabs, when the currently selected tab is a tab on the far left side of the tab bar, attempting to scroll to the end (far right) side of the tab bar will often cause scrolling to freeze momentarily, and then reset to far left, to the currently selected tab, and continues scrolling from the beginning of the tab bar, making it unnecessarily difficult to scroll to the end of a long tabs bar. This occurs when scrolling up/down with the scroll-wheel on a mouse, when scrolling up/down/left/right on a touchpad, and when scrolling using the left and right scroll buttons in the tab bar.