- Perform a two-finger swipe-to-nav gesture, moving your fingers very slowly.
- When the icon changes color to show that it's been "activated" (but before you've gone far enough to cause navigation to happen as you swipe), press your touchpad to "click" it. (This causes a context menu to appear for whatever element you're hovering.)
- Release your fingers from the touchpad.
- (optional) Click somewhere else on the page; try typing into a text field, switching tabs away & back, etc.
The context menu seems to prevent the swipe-to-nav navigation from occurring; but the UI remains in place. So you end up looking at the same page, with the arrow overlay permanently in place This persists even as you interact with the page by e.g. typing text, scrolling with arrow keys, switching tabs. However, if you perform any two-finger gesture at this point (e.g. two-finger scroll), then the swipe-to-nav UI gets unstuck and the navigation suddenly happens.
UX shouldn't stick. Probably the context-menu should cause the navigation to be fully canceled and the UI should disappear.