HYPER-ANCHOR is the next generation of bookmark. You can make HYPER-ANCHOR for any element of a webpage (sentence, image, table, etc...), and put it into the bookmark menu. When you use HYPER-ANCHOR from the menu, you can easily return to the element. You don't need to search the position of the element in the web page, HYPER-ANCHOR leads you to the position by scrolling and informs of the element by using your own choice of customized indication method.
This add-on is not compatible with your version of Firefox because of the following: