I'd like to add a few things:
1. The screenshot like what
@Pierce posted, will be broken. It's not a browser problem and is a result of a web browser page that doesn't have enough horizontal length for things to work right. That problem has existed for more than 2 years, and is part of life if the screen isn't wide enough. I usually solve it by widening the screen (a refresh typically isn't required either). In particular, if you don't have enough horizontal area for the top row of buttons to appear, you'll have problems with the rendering.
2. 9.10.2-U2 though U5 has some kind of odd django and/or nginx problem (it could be on older versions, but the TrueNAS support team didn't see it until U2). When I saw it the 3-5 times I did, the pages 1/2 render, and then seem to stop as if nginx decides it has sent the whole page. The reporting tab was particular bad with none/some of the charts drawn, but the rest were not rendered. One of the developers tried to isolate the bug, but we could never isolate it. We don't know what triggers it. Since we were upgrading the version with 11.0, we chose to wait and see what 11.0 had to offer since it had an updated django and nginx. I haven't seen the problem that I saw in 11.0 at all, nor have I heard of any reports from TrueNAS customers that had the problem.
3. I've heard lots of reports of Chrome not working with the newer versions of FreeNAS and TrueNAS. I personally have never had a problem with it at all. Generally I recommend Chrome or Firefox first, then whatever you want to use as an alternative because they all generally get shaky. I realize this goes against what this thread says, I'm just sharing what I've personally seen, experienced, and recommend. Clearing browser caches and disabling addons fixes any problems I've seen with Chrome or Firefox. I haven't seen any problems with Chrome or Firefox on any 11.0 release that wasn't fix with clearing caches or disabling addons. /shrug