Since November 2018, GitHub have started to display forced push events to pull request page timelines. This bookmarklet will toggle display of these events if they are getting in the way of meaningful commits.
Add the code below as the URL of a new bookmark:
javascript:((d)=>{if(d.getElementById('nuke-fp')==null){let e=d.createElement('style');e.id='nuke-fp';e.innerHTML='.nuke-fp{display:none}';d.getElementsByTagName('head')[0].appendChild(e)}for(let e of Array.from(d.querySelectorAll('.discussion-timeline .discussion-item-head_ref_force_pushed'))){e.classList.toggle('nuke-fp')}})(document)
Tested with Chrome 70.0.3538.102.
Uncompressed source provided below.