Keyboard shortcuts are neat, but they don’t work for me. On my own computers I always use some Vim -keybinding plugins (Vimperator, Pentadactyl, Vimium or similar), so sites own keyboard shortcuts doesn’t work (or well, need to escape from browser extension to pass them through to site, which makes it more complicated 
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I have mouse with more buttons than I have figured sensible bindings for, and I use it’s back/forward quite often in browsing. Still, there are times when I prefer to get into very beginning of forum, and not backtrack there 