On Android, click the 3-dots to get the menu. Tap 'Add-ons' Tap 'Scroll to bottom' to scroll the current tab to the bottom of the page.
On desktop it adds a green down-arrow icon to the toolbar.
There is a companion add-on - Android scroll top
On a responsive site, one which fetches more content automatically when you read to the bottom, it will scroll to the bottom of what's currently downloaded.
