There is a similar idea with additional UI details over here.Also there's already a bug for this where you can track implementation state.Even an MDN article on Text fragments exists already, only it's not applicable to Firefox.Mozilla's position on ...
These are great thoughts and very practical UI improvements. Once basic support as in this idea and that bug is in place they should be tackled or even better included right from the start. @Reggie For supporting the nth ocurrence of a search term yo...