Takes a wee while to start (1GHz Pandora underclocked to 800MHz) but works well once it's running, I've not noticed any downloading issues (so far!)

Chromium is much much faster, but I still prefer Firefox. Thanks for the effort. I needed to delete my previous appdata to update from 11.0 .. I didn't feel like troubleshooting.

It's really fast. Very smooth scrolling. Youtube is very fluent at 240p. I use it with Smartvideo addon for configuring youtube videos (default quality, buffering, loop, etc).

i have that problem too. the downloads finish very fast and nothing was downloaded. so i dont do any downloading on my pandora

I can't complete any download with FF because it just finishes a file way before every byte arrived. A 4.6mb file gets 'completed' with only 2mb for example. Downloading even bigger files (30mb) does work with PNDmanager though. Same problem with FF 12 on a laptop, so it seemsFFand/or ISPrelated.