JumpToContent is a script that helps keyboard navigation by adding a hidden link inside a secondary sticky header, which sends the user to the "Expand"/"Collapse" buttons on the left of the screen, which is close to the table of contents and to the page's content itself.
This improves the experience for keyboard and disabled people alike by giving them the choice to skip all >25 navigation links that they have to go through every single time they visit a page, and even more ↹ Tab presses are saved if they want to go to a specific section of an article.