If you’re having trouble while downloading large files during peak hours, you must be looking for a lightweight Firefox addon for scheduling your downloads for a later time. What we recommend is to install a small Firefox extension called Download Scheduler – to schedule your downloads for off-peak hours.
Once the installation is done, right click on any link in the browser and click “Schedule Link As…” in the context menu. This will automatically add the download to the scheduled time.
You can set time for your downloads to start and stop by going to Addons Menu —-> Extensions—->Download Scheduler plugin—->Options.
Furthermore, you can also manually add links or edit existing ones by going to Tools —-> Download Scheduler.