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Since recently I started to get very heavy CPU load on my 64bit Debian 9.0 Cinnamon machine. I have all my packages up to date including Firefox-ESR. Often the load is so heavy that I can hear my CPU.

I also get it when restarting the browser in safe-mode. I did not get CPU load spikes before restoring my session for the time I tried.

I also did a ClamAV scan like so: clamscan -r --bell -i --exclude-dir="^/sys" / -l clamav1.log which tells me infected files are 0. And rkhunter also tells me that there are no rootkits.

Early screenshot of system monitor (also I don't know how listening to soundcloud & youtube can upload so much data but that's another question I guess?): Early screenshot of system monitor (also I don't know how listening to soundcloud & youtube can upload so much data but that's another question I guess?) When I open about:performance to check what causes the load that very tab 'seems to be it' (note the CPU usage percentage): When I open about:performance to check what causes the load that very tab 'seems to be it' (note the CPU usage percentage) In safe mode: In safe mode

I also get this when having just one tab open. Could tabs that aren't even loaded be causing this? Any ideas what might cause this or any suggestions for things that I could try? Note that I'm relatively new to Linux/Debian; also I'm not that sure if this would fit better into unix.stackexchange.

closed as off-topic by schroeder Feb 22 '18 at 14:04

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about Information security within the scope defined in the help center." – schroeder
If this question can be reworded to fit the rules in the help center, please edit the question.

  • Video is one of the most bandwidth intensive work your typical computer would do. Especially if you set your quality to HD, it's easy to rake up gigabytes. Most CPU/GPU has video decoder accelerator though, so playing the video itself shouldn't be compute intensive. – Lie Ryan Jul 10 '17 at 4:13
  • @LieRyan Thanks; that might be the cause of the ~200MB upload over a day or so. But it's certainly not the cause for the heavy CPU load as I didn't have any tab with video open. In the bottom screenshot I have only one tab (no video) aside of about:performance opened. – mYnDstrEAm Jul 10 '17 at 9:21
  • Unfortunately, we are not a malware or troubleshooting forum. The best suggestion we can give is to reinstall firefox and install extensions one at a time and see the performance stats at each stage, – schroeder Feb 22 '18 at 14:04
  • Probably is malware--where malware is defined as including any active adobe product/plugin. – Bill K Nov 2 '18 at 16:58