I tried to search for something in Iceweasel’s Google Box and it return three pages of results:
After that, when I click in results’ page 2 or 3, it returns only two pages of results:
If I make the same search in http://www.google.pt, it returns only two pages of results. I reproduced this several times. Do you think this can be a bug in Google Box of Iceweasel? Do you have some possible explanation for this?