Custom keyboard shortcuts for scrolling
Alt+arrows scroll the page by one screen and Alt+End jumps smoothly to the bottom.
Code to copy
document.addEventListener('keydown', function (e) {
var tag = (e.target.tagName || '').toLowerCase();
if (tag === 'input' || tag === 'textarea' || e.target.isContentEditable) return;
if (!e.altKey || e.ctrlKey || e.metaKey) return;
var step = Math.round(window.innerHeight * 0.9);
if (e.key === 'ArrowDown') {
e.preventDefault();
window.scrollBy({ top: step, behavior: 'smooth' });
} else if (e.key === 'ArrowUp') {
e.preventDefault();
window.scrollBy({ top: -step, behavior: 'smooth' });
} else if (e.key === 'End') {
e.preventDefault();
window.scrollTo({ top: document.body.scrollHeight, behavior: 'smooth' });
}
});How to use this example
- Copy the code with the button above.
- Install JustZix (2 minutes) and open the extension on the target page.
- Add a new rule matching that page.
- Paste the code into the rule's JavaScript panel and save — it runs on every page visit.
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