- The links it produces are wrong, making it out of sync with forum pages. E.g. if a post has 11 replies, it will take you to a page showing ONLY the 10th and 11th replies, and you won't be able to easily navigate to see previous replies because as far as the forum is concerned the post only has one page and you're on it.
- The links all open in the same tab. E.g. clicking a link will open a new tab. Clicking another link, without closing the first, will replace the content of the first link instead of opening another new tab.
EDIT: the original widget had been fixed, a userscript is no longer required.