minor blegs

So I use the "Minima" template for this here blog. If I use Minima Stretch, my quote, picture heading and About Me all fit nicely on the left hand side; but the posts are too stretched out. If I use the regular Minima template, the posts are just the way I want them but the stuff on the left is annoyingly laid out (as you can see). Anybody know how I can have both the wider sidebar and the skinnier posts?

Also, does anyone else have the problem with Firefox where, when you've got streaming video going in a tab, you can't click over to another tab? Sometimes with Youtube or similar I click another tab but it stays stuck on the page with the streaming video. It's not a big deal, I'm just wondering if anyone else has the same problem.