TextNav add-on has been discontinued. TextNav functionality has been merged into NVDA core starting with version 2024.2. It is implemented as a quick navigation gesture and is assigned by default to p and shift+p.
TextNav is a new better way to navigate Internet for the blind. It allows you to quickly find readable content on almost any webpage on the Internet with just a single keystroke. Check out a short audio demo (7 minutes audio file):
https://soundcloud.com/user-977282820/textnav-promo
More precisely, TextNav adds a keystroke to jump to next or previous text paragraphs - that is a paragraph containing one or more sentences, separated by periods. This feature might be useful to quickly find the textual part of a web page or to skip over menus, advertisements and other not important page elements.
TextNav was formerly a part of SentenceNav add-on.
Source code is available at http://github.com/mltony/nvda-text-nav.