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.
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).