i’ve been experiencing some problems with this browser’ feature.
if i’m writing a post and i accidentally hold down the ‘cmd’ key on my keyboard and then the left arrow, the browser goes back one page; that’s fine…it’s the way it should work, but, sometimes i find myself wanting to move ‘between words’ and i use ‘alt’+left/right arrow and that’s when things could go wrong if i hit the wrong key (i had to rewrite entire posts few times 
)
i noticed that this doesn’t happen when writing the title of the topic, rather, holding down ‘cmd’+left/right arrow moves the cursor to either beginning/end of the title.
it would be good to disable the ‘back one page’ feature, it could save a lot of extra writing and at some stages, extra stress 
Firefox 22.0 - OSX 10.7.5