my Firefox doesn't display Tumblr controls

[ratcreature]

I'd been trying to use Tumblr, and found it hard to use, but it turns out that I'm just not seeing all controls in in my Firefox (still on version 3.6.18 on Ubuntu 10.10, so far I've been too lazy to update). Anyway, in Firefox when I'm logged in I don't see the icons to (un)subscribe and get to the dashboard that should appear in the top right corner. If I use another browser they are there. I use NoScript, but have allowed all Javascript on the page, and I have also turned off my AdBlockPlus on the chance that that might interfere in some accidental way, but neither helps. Does anyone have an idea why the Tumblr controls are invisible?