Safari extension to save your place on a web page.
Placemarker, a Safari extension, is for those times when you wish you could save your place in a long web page so you could come back to that point later without having to search for it. Placemarker lets you create special bookmarks, called placemarks, that it saves to Instapaper or Read It Later, whichever service you prefer. (You can also save a placemark as a Safari bookmark, though you'll have to save the bookmark manually.)
The magic happens when you later open the placemark: Safari will automatically scroll to the phrase you selected when you created the placemark.