a11y-outline is a Firefox extension designed to improve web navigation for both developers and users. This tool mimics the functionality of screen readers by enabling users to access lists of landmarks, headings, and links directly from their browser. It is particularly beneficial for sighted web developers who wish to understand how visually impaired users interact with their content. Additionally, it serves sighted users who prefer a more structured navigation method.

By pressing Ctrl+Shift+7, users can open a dialog that lists these elements, allowing for easy selection using the up and down arrow keys. Once a list is selected, users can switch focus to it and navigate further with the arrow keys, making it a valuable tool for enhancing accessibility in web development.