Or just click the 'Show All Watched Threads' link at the bottom, and bookmark that.
I already have it bookmarked on this computer but it would have to be done every time you change computers or devices or browsers. I just want it work like the old UserCP key and all those extra steps are eliminated.
@Foxfyre
Here's a stroke that may make it slightly easier I just figured out--
The only difference in the link for "watched threads" (that doesn't show already-read ones) and "all watched threads" (that does) is the </all> at the end of the URL. So clicking "watched" and then adding "/all" to the URL will take you there. Still an extra step but easier than going to Bookmarks.
(the Bookmark function, especially in Firefox, is a convoluted couterinuitive mess)