Support displaying page with "No style"?

[arai-a]

On Firefox, you can disable page styling by [View]-[Page Style]-[No Style].

With it, the index page has some issues:

• there's a huge circle with 100% width (spidermonkey logo for small-width env)
• matrix's link icon "[m]" is also shown with 100% width
• minor: "SpiderMonkey" logo for large-width env is also shown bigger, but not much problematic