Changes all grey comments to black.
Maybe this is obvious, or there's an existing quick tool for this, but I've tried so many times to read super-light grey text, with no instant way at hand of making it readable. I would've loved this had someone else posted it, so.. Enjoy!
javascript:(function(){var i,x=document.querySelectorAll(".commtext");for (i=0;i<x.length;i++) x[i].className='commtext c00'})();
How to bookmarklet: Save it as a bookmark URL called 'ungrey', then drag it to the bookmarks bar, or make a key shortcut.
(thanks to bjourne for asking and skylark for answering - https://news.ycombinator.com/item?id=18940063 . I have old browser, so modified skylark's answer.)
