So the idea behind this is that when reading topics there's a lot of clutter that distracts from the reading experience. As well as there being certain important details that are hard to spot or infer from the way the information is presented. And that removing all off the clutter will lead to a better experience reading.
Whether that is true or not, I don't really know. I love this bookmarklet I made though. It makes reading up on long threads much better. And my favorite thing from this bookmarklet is that it tells the flow of time in a thread by inserting text saying how much later the next post was made, with the size of that text depending on how long period passed. This is trivial for a computer to calculate and display, but quite hard for humans to infer from post dates. Yet for some reason I've never seen any forum does this.
Save the text bellow (use the [select] button to select it all) as the location for a bookmark, then click on the bookmark when in a thread to transform it.
Note: Be careful about bookmarklets, they run code as you and could impersonate you on the site you run them on. This one is harmless, but you only really have my word for it.
javascript:(function()%20{function%20keep(url)%20{if%20(url.substr(-6)%20===%20"hs.css"%20||%20url.substr(-6)%20===%20"am.css")%20{return%20true;}%20else%20{return%20false;}}var%20nodes%20=%20document.getElementsByTagName('link');for%20(var%20i=0;%20i%20<%20nodes.length;%20i++)%20{var%20n%20=%20nodes.item(i);if%20(n.getAttribute('rel')%20===%20'stylesheet'%20&&%20!keep(n.getAttribute('href')))%20{n.setAttribute('rel',%20'disabled_stylesheet');}}var%20style%20=%20document.createElement('style');style.innerHTML%20=%20'#header,%20#forumheader,%20#moderationbuttons,%20#quickreplybox,#display_jump_to,%20#footer_section,%20#forumposts%20>%20div:first-child%20>%20h3%20>%20img,#forumposts%20>%20div:first-child%20>%20h3%20>%20span:first-of-type,%20.navigate_section,.pagesection,%20hr.post_separator{display:%20none;}html%20{font:%201.2em/130%%20Helvetica,%20sans-serif;}@media%20(min-width:%2048em)%20{html%20{background:%20linear-gradient(to%20right,%20#6DA1C0,%20#446B89,%20#6DA1C0);}body%20{padding:%202em;background:%20white;width:%2035em;margin:%200%20auto;box-shadow:%200%200%201.2em%20#3E6598;border:%200.25em%20solid%20#9AC4ED;border-top:%20none;border-bottom:%20none;}}@media%20(max-width:%2047.99em)%20{body%20{margin:%200.6em;}}#wrapper%20{width:%20100%%20!important;}#poll%20{background:%20#EBF5EC;padding:%200%201em%201em;margin:%200;overflow:%20auto;}#pollmoderation%20{margin-bottom:%206em;}#forumposts%20>%20div%20>%20h3%20{font-size:%20140%;line-height:%20125%;text-align:%20center;margin-top:%200;}form%20>%20div%20>%20div%20{position:%20relative;}div.poster%20>%20h4%20{position:%20absolute;left:%204em;top:%20-0.5em;}h4.no-avatar%20{left:%200%20!important;}div.poster%20>%20h4%20>%20a%20{color:%20black;}div.poster%20>%20ul%20{padding:%200;margin:%200;}div.poster%20>%20ul%20>%20li.avatar%20{display:%20table-cell;height:%203em;width:%203em;vertical-align:%20middle;text-align:%20right;}div.poster%20>%20ul%20>%20li.avatar%20>%20a%20>%20img.avatar%20{max-width:%203em;max-height:%203em;vertical-align:%20middle;}div.poster%20>%20ul%20{height:%203em;}div.keyinfo%20>%20h5%20{position:%20absolute;right:%200;top:%20-1em;}div.keyinfo%20>%20h5%20>%20a%20{color:%20black;}h5.useless-subject%20{display:%20none;}div.keyinfo%20>%20div.smalltext%20{position:%20absolute;top:%203em;right:%200;font-family:%20"Comic%20Sans%20MS",%20sans;font-size:%2060%;}.post%20{margin-top:%200.5em;padding-top:%200.5em;border-top:%200.15em%20solid%20#9AC4ED;}div.poster%20%20>%20ul%20>%20li:not(.avatar),.quickbuttons,%20.reportlinks,%20.messageicon,%20.signature{display:%20none;}.moderatorbar%20{margin-bottom:%205em;}.moderatorbar%20>%20.modified%20{float:%20right;}.post%20{font-family:%20"Raleway",%20sans-serif;}br.soft-break%20{margin-bottom:%200.7em;}a#new%20{display:%20block;background:%20#9AC4ED;height:%200.25em;margin-bottom:%204.25em;}blockquote::before%20{color:%20#46718A;content:%20"%E2%80%9C";font-size:%203em;float:%20left;margin-left:%20-39px;margin-top:%207px;}blockquote%20{background:%20#E1F3FB;padding:%2029px%2059px;margin:%200;}blockquote::after%20{color:%20#46718A;content:%20"%E2%80%9D";font-size:%203em;float:%20right;margin-right:%20-39px;margin-top:%2038px;}div.quoteheader%20{font-family:%20Helvetica,%20sans-serif;text-align:%20right;margin-right:%2034px;margin-top:%200.3em;}div.pagesection%20~%20div.pagesection%20{display:%20block;}div.pagesection%20~%20div.pagesection%20>%20div.buttonlist,%20div.nextlinks_bottom%20{display:%20none;}div.pagesection%20~%20div.pagesection%20>%20div.pagelinks%20{float:%20right;}.timeflow%20{margin:%200%200%201em;text-align:%20center;font-family:%20"Comic%20Sans%20MS",%20sans;}.tfsmall%20{font-size:%2080%;color:%20gray}.tflarge%20{font-size:%20150%}a{color:%20#46718A;text-decoration:%20none;}a:hover{color:%20#385D74;text-decoration:%20underline;}table{empty-cells:%20show;}code{display:%20block;font-family:%20"courier%20new",%20monospace;background:%20#E1F3FB;border:%201px%20solid%20#000000;line-height:%201.3em;padding:%200.2em%200.4em;overflow:%20auto;white-space:%20pre;max-height:%2024em;}body%20>%20div.highslide-container%20{font-size:%200.8em;font-family:%20inherit;}body%20>%20div.highslide-container%20div%20{font-size:%20inherit;font-family:%20inherit;}div.aeva_caption%20{font-size:%200.8em;}body%20>%20div.highslide-container%20div.highslide-caption%20{font-family:%20"Raleway",%20sans-serif;}';document.head.appendChild(style);function%20formatDuration(d)%20{d%20/=%201000;%20var%20scope%20=%20'later';if%20(d%20<%200)%20{scope%20=%20'ago';d%20=%20-d;}if%20(d%20<%202)%20{return%20'Less%20than%20a%20second%20'+scope;}if%20(d%20<%20120)%20{return%20d.toFixed()+'%20seconds%20'+scope;}d%20/=%2060;%20if%20(d%20<%20120)%20{return%20d.toFixed()+'%20minutes%20'+scope;}d%20/=%2060;%20if%20(d%20<%2048)%20{return%20d.toFixed()+'%20hours%20'+scope;}d%20/=%2024;%20if%20(d%20<%2060)%20{return%20d.toFixed()+'%20days%20'+scope;}d%20/=%2030;%20if%20(d%20<%2024)%20{return%20d.toFixed()+'%20months%20'+scope;}d%20/=%2012;%20return%20d.toFixed()+'%20years%20'+scope;}function%20ordinal(i)%20{if%20(i%20<=%2011%20||%20i%20>=%2013)%20return%20String(i)+'th';else%20if%20(i%20%%2010%20===%202)%20return%20String(i)+'nd';else%20if%20(i%20%%2010%20===%203)%20return%20String(i)+'rd';else%20return%20String(i)+'th';}function%20formatDate(time)%20{var%20months%20=%20['Jan',%20'Feb',%20'Mar',%20'Apr',%20'May',%20'June','July',%20'Aug',%20'Sept',%20'Oct',%20'Nov',%20'Dec'];var%20date%20=%20new%20Date(time);var%20this_year%20=%20(new%20Date()).getFullYear();if%20(date.getFullYear()%20!==%20this_year)%20{var%20year%20=%20',%20'+date.getFullYear();}%20else%20{var%20year%20=%20'';}return%20months[date.getMonth()]+'%20'+ordinal(date.getDate())+year;}function%20getDateFromString(date_string)%20{date_string%20=%20date_string.replace(/Yesterday%20at/,%20(new%20Date(Date.now()%20-%203600*24000)).toDateString());date_string%20=%20date_string.replace(/Today%20at/,%20(new%20Date()).toDateString());date_string%20=%20date_string.replace(/(\d+)-(\d+)-(\d+),%20(.*)/,%20'$3-$2-$1T$4');if%20(date_string.replace(/^(\d+)-.*$/,%20'$1')%20<%202000)%20{date_string%20=%20date_string.replace(/(\d+)-(\d+)-(\d+)T(.*)/,%20'$3-$2-$1T$4');}return%20Date.parse(date_string);}var%20infoblocks%20=%20document.getElementsByClassName('keyinfo');var%20last_time%20=%20new%20Date();var%20topic%20=%20document.getElementsByClassName('catbg')[0].textContent.replace(/[\s\S]*Topic:%20(.*)%20.\(Read[\s\S]*/,%20'$1');for%20(var%20i=0;%20i%20<%20infoblocks.length;%20i++)%20{var%20infoblock%20=%20infoblocks[i];var%20subject%20=%20infoblock.children[1];if%20(subject.children[0].text%20===%20'Re:%20'+topic%20||%20subject.children[0].text%20===%20topic)%20{subject.className%20=%20'useless-subject'}var%20timeblock%20=%20infoblock.getElementsByClassName('smalltext')[0];var%20date_string%20=%20timeblock.textContent.replace(/[^:]*:.(.*)../,%20'$1');var%20time%20=%20getDateFromString(date_string);timeblock.innerHTML%20=%20formatDate(time);var%20difference%20=%20time%20-%20last_time;if%20(Math.abs(difference)%20<%20(1000%20*%203600%20*%2024%20*%203))%20continue;%20var%20flow%20=%20document.createElement('div');var%20scope%20=%20'tfsmall';if%20(Math.abs(difference)%20>%20(1000%20*%203600%20*%2024%20*%2030%20*%2012))%20{scope%20=%20'tflarge';}%20else%20if%20(Math.abs(difference)%20>%20(1000%20*%203600%20*%2024%20*%2030))%20{scope%20=%20'tfmedium';}%20flow.className%20=%20'timeflow%20'+scope;flow.innerHTML%20=%20formatDuration(difference);var%20post%20=%20infoblock.parentNode.parentNode.parentNode.parentNode;post.parentNode.insertBefore(flow,%20post);last_time%20=%20time;}var%20title%20=%20document.getElementsByClassName('catbg')[0];title.textContent%20=%20title.textContent.replace(/[\s\S]*Topic:%20(.*)%20.\(Read%20[0-9]+%20times\)/,%20'$1');var%20posts%20=%20document.getElementsByClassName('inner');for%20(var%20i=0;%20i%20<%20posts.length;%20i++)%20{var%20post%20=%20posts[i];var%20nodes%20=%20post.childNodes;for%20(var%20j=1;%20j%20<%20nodes.length-1;%20j++)%20{if%20(nodes[j].nodeName.toLowerCase()%20===%20'br'&&%20!(nodes[j-1].nodeName.toLowerCase()%20===%20'br'||%20nodes[j-1].nodeName.toLowerCase()%20===%20'hr')&&%20!(nodes[j+1].nodeName.toLowerCase()%20===%20'br'||%20nodes[j+1].nodeName.toLowerCase()%20===%20'hr'))%20{nodes[j].className%20=%20'soft-break';}}}var%20bbcSizes%20=%20document.getElementsByClassName('bbc_size');for%20(var%20i=0;%20i%20<%20bbcSizes.length;%20i++)%20{var%20bbcSize%20=%20bbcSizes[i];var%20style%20=%20bbcSize.getAttribute('style');var%20size%20=%20style.replace(/font-size:%20([0-9]+)pt;/,%20'$1')%20/%209.12;bbcSize.setAttribute('style',%20"font-size:%20"+(size*100)+"%;");}var%20blockquotes%20=%20document.getElementsByClassName('bbc_standard_quote');for%20(var%20i=0;%20i%20<%20blockquotes.length;%20++i)%20{var%20quote%20=%20blockquotes[i];var%20head%20=%20quote.previousSibling;var%20footer%20=%20quote.parentNode.insertBefore(head,%20quote.nextSibling);var%20anchor%20=%20footer.firstChild.firstChild;if%20(anchor.text%20===%20undefined)%20{footer.parentNode.removeChild(footer);}%20else%20{anchor.text%20=%20anchor.text.replace(/Quote%20from:%20(.*)%20on%20.*/,%20'%E2%80%94$1');}var%20nodes%20=%20quote.childNodes;if%20(nodes.length%20<%201)%20continue;var%20end%20=%20nodes[nodes.length-1];if%20(end.nodeName.toLowerCase()%20===%20'br')%20{quote.removeChild(end);}}var%20posters%20=%20document.getElementsByClassName('poster');for%20(var%20i=0;%20i%20<%20posters.length;%20++i)%20{var%20poster%20=%20posters[i];if%20(!poster.getElementsByClassName('avatar').length)%20{poster.children[0].className%20=%20'no-avatar';}}window.WebFontConfig%20=%20{google:%20{%20families:%20[%20'Raleway::latin'%20]%20}};(function()%20{var%20wf%20=%20document.createElement('script');wf.src%20=%20('https:'%20==%20document.location.protocol%20?%20'https'%20:%20'http')%20+'://ajax.googleapis.com/ajax/libs/webfont/1/webfont.js';wf.type%20=%20'text/javascript';wf.async%20=%20'true';var%20s%20=%20document.getElementsByTagName('script')[0];s.parentNode.insertBefore(wf,%20s);})();})()