good UI, algorithm can be improved Rated 4 out of 5 stars
The UI is really nice and easy but the fact that the algorithm only tries the last numeral in each link makes it fail in some instances:
Here you have page number (free_p) and a sort key (free_s) - free_p should be increased / decreased.
The easiest way to achieve this (without scanning page contents) would be to look at the immediate (back-fwd) history and look for patterns. This way the user could send PN "on its way" by doing the first (next page) link manually.
Re: good UI, algorithm can be improved
You right, this can be improved and it\'s a feature that will be (i hope :)) achieve for the new version of extension (1.4+)\r\nSorry, the addon should be updated before but i was waiting (like all of us) the new version of Firefox (3.5).