I should preface this by saying that honestly, I have no idea what I'm doing. This is simply my attempt to fiddle things into something closer to the readable page FF.net used to have, and I thought I might as well share the result with someone else who might be interested. I can make no guarantees that this will work for all users or that I'll be able to help anyone with a problem, but I'm certainly willing to give it a shot. I am also more than willing to try to implement something additional if there's a request for it, but as I've mentioned, I barely know what I'm doing. I can only promise to try.

6.8.12
Version 1.0
∙removes excess space/margins on the sides of all pages and recolors them from grey to white
∙removes avatars/story covers from the summaries shown on story pages
∙removes banner and square ads from story and profile pages (or at least most of them, I think)

8.4.12
Version 1.1
∙restores purple color to already-visited hyperlinks

8.6.12
Version 1.2
∙restores default font type to Verdana rather than Arial

3.27.13
Version 1.3
∙removes minimum story content width restrictions, allowing narrow windows without scrolling

3.23.15
Version 1.4
∙updated adblock containers
∙removed code for tiny text & Share link removal at bottom (no longer visually distracting)