Greasy Fork is available in English.
Now it works on all tumblr blogs even if not with a tumblr domain. Adds a draggable navigation panel that contains buttons for newer page, older page, home and archive. The script stores the position of the panel.
a suggestion
I think this is a useful tool, but I'm wondering if it would be possible to disable the infinite browsing on individual tumblr, or on the dashboard. When reaching the bottom of a page, it shows the next set of images automatically. After I do this for a good while, I'll end up crashing from so many images loaded, and would end up just scrolling all the way back down just to reach images from before.