Currently on Firefox 83.0 Windows. This specific problem started about 2 versions ago. I thought for certain it would be fixed in a release but has not. It is serious enough that after decades of Firefox I am considering moving on. '''Situation:''' When scanning a long site like Feedly, I use the middle button to set auto scroll and start scrolling down, speeding up / slowing down as needed. '''Previous behavior:''' When an article appears interesting, I would Left Click the mouse to cancel auto scroll, move the cursor to the article link, click on the article to read. Simple. '''Problem:''' When Left Clicking to stop the scroll, Firefox positions the web page much further down the page requiring manual scrolling back to find the article. A SERIOUS usability killer! '''Testing:''' Testing in IE 11 and the new Chromium Edge shows correct behavior. '''Solution:''' Please restore Previous behavior as described. '''Priority:''' Very important