I got a problem, only once but it was a worrisome error: I did a search on YouTube then Firefox froze, then the screen went black, and the resolution was changed, the colors were "bitmap-like" (pixelated and limited) and a window said that there was an error with the ATI driver. I opened Task Manager and saw that Firefox was using 50% of the CPU: I tried to shut down the process but it didn't work. Then I restarted the computer and it was all ok. Now I noticed in Task Manager that Firefox uses a lot of memory but I'm not sure if the same as before: if Firefox is closed and I open it, with Google being the initial page, the memory is at 250 MB (right now it is at 280 MB). And when I'm playing a YouTube video the plugin-container process takes another 140 MB. I tried with the safe-mode and Firefox takes 170 MB and plugin-container 150 MB while playing a video (approximately). Is it normal? I have: - Windows XP; - latest version of Firefox (32.0.3); - the only active add-on is AdBlock (+ 2 inactive ones); - the only active plugin is Shockwave Flash, updated (+ 5 inactive ones); - Core2 2.40 GHz and 2 GB of RAM.