One feature of the new Mozilla based browser is spacial scrolling. This is where you press the hardware up and down keys and the browser focus jumps to the next/previous link on the page.
I can see a use for this but on pages where links are far apart from each other, say the top and bottom, the ‘scroll’ actually misses out the whole of the page. This can become annoying if you are using the hardware keys for one handed scrolling.
If, like me you want to turn this feature off there is an option within the browser to do so.
Open a browser window and type about:config into the address bar. In the set preference name box type snav.enabled and in the value box type false. Scrolling should now be more ‘predictable’.