Config and issue
I have a late 2011 MBP, running Mac OS X 10.7.5, 2.3 GHz Intel Core i5, with 16GB 1600 MHz DDR3.
I have just updated my firefox 20 to 25, this issue also occurred with v 20.
When I am uploading files, or just general browsing, sometimes I get a few firefox processes which start to use up CPU cycles, consequently my fans start to spin up.
If I quit Firefox, the processes stay active.
Here is what I have done so far:
ps aux|grep firefox
macbook-pro:~ <my user>$ ps aux|grep firefox
<my user> 29061 84.7 0.0 3699392 304 ?? R 7:10am 22:13.43 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_7837561
<my user> 29063 84.0 0.0 3701448 304 ?? R 7:10am 22:11.08 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_7837561
<my user> 29060 83.9 0.0 3698344 304 ?? R 7:10am 22:10.60 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_7837561
<my user> 29068 83.4 0.0 3701448 304 ?? R 7:10am 22:10.83 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_7837561
<my user> 29161 0.6 0.0 2434892 548 s002 S+ 7:39am 0:00.00 grep firefox
top -o cpu
Processes: 119 total, 6 running, 2 stuck, 111 sleeping, 496 threads 08:06:00
Load Avg: 4.37, 4.38, 4.30 CPU usage: 61.74% user, 36.1% sys, 2.23% idle SharedLibs: 1944K resident, 0B data, 0B linkedit.
MemRegions: 34474 total, 1609M resident, 56M private, 1254M shared. PhysMem: 1943M wired, 3222M active, 1978M inactive, 7143M used, 9239M free.
VM: 316G vsize, 1092M framework vsize, 6367238(0) pageins, 189344(0) pageouts. Networks: packets: 19241649/15G in, 16860749/7587M out.
Disks: 2829594/65G read, 2171245/68G written.
PID COMMAND %CPU TIME #TH #WQ #POR #MREG RPRVT RSHRD RSIZE VPRVT VSIZE PGRP PPID STATE UID FAULTS COW MSGSENT MSGRECV SYSBSD
29063 firefox 82.2 44:11.02 1/1 0 9 2677 9724K 397M 304K 11M 3615M 28962 1 running 503 85 20 16 8 3
29061 firefox 82.2 44:15.85 1/1 0 9 2675 9252K 397M 304K 10M 3613M 28962 1 running 503 85 36 16 8 3
29068 firefox 81.9 44:10.64 1/1 0 9 2677 11M 397M 304K 13M 3615M 28962 1 running 503 85 17 16 8 3
29060 firefox 81.7 44:09.96 1/1 0 9 2671 9820K 397M 304K 10M 3612M 28962 1 running 503 85 35 16 8 3
29089 top 10.7 05:43.93 1/1 0 49 32 2476K 216K 3180K 18M 2378M 29089 29083 running 0 2238348+ 84 227566032+ 113774272+ 1011116+
I've also opensnooped all the relevant processes. There are no files being accessed.
For example, the following shows nothing:
bash-3.2# opensnoop -p 29063
UID PID COMM FD PATH
There is nothing of relevance in dmesg.
bash-3.2# cat /var/log/system.log|grep fire yealds:
Nov 7 06:23:10 ff-macbook-pro [0x0-0x779779].org.mozilla.firefox[28962]: FoxyProxy settingsDir: /Users/michaelpeters/Library/Application Support/Firefox/Profiles/w5sjmxcx.default/foxyproxy.xml
Nov 7 07:11:10 ff-macbook-pro firefox[28962]: timed out waiting for helper registration
Nov 7 07:11:35 ff-macbook-pro firefox[28962]: invalid context
Nov 7 07:12:32 ff-macbook-pro firefox[28962]: invalid context
Nov 7 07:37:13 ff-macbook-pro firefox[28962]: invalid context
Nov 7 07:37:25 ff-macbook-pro [0x0-0x779779].org.mozilla.firefox[28962]: NOTE: child process received `Goodbye', closing down
In the past I have just cleaned up the processes with kill -s 9
but it would be nice to know what is going on.
Question
What next steps could I take to help me understand this behaviour? If it looks like a bug I am happy to submit to the mozilla community.
Update:
I have tried safe mode and the behaviour persists, however it is definitely upload processes:
When I upload a file to a website, firefox spawns these processes, one per file:
5134 92.5 0.0 3829668 308 ?? R 6:31pm 6:53.37 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_135201
5130 91.7 0.0 3826524 308 ?? R 6:31pm 6:53.18 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_135201
5135 89.8 0.0 3831244 308 ?? R 6:31pm 6:52.96 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_135201
If I close firefox, the processes change from -psn to -foreground as identified below, the new firefox session uses almost no cpu cycles at all.
ps aux|grep fire
5191 99.9 0.0 3516256 292 ?? R 6:41pm 8:03.21 /Applications/Firefox.app/Contents/MacOS/firefox -foreground
5184 99.9 0.0 3501868 292 ?? R 6:41pm 8:03.11 /Applications/Firefox.app/Contents/MacOS/firefox -foreground
5234 0.3 0.8 3466336 138620 ?? S 6:49pm 0:02.43 /Applications/Firefox.app/Contents/MacOS/firefox -psn_0_897243
Best Answer
I have not seen multiple Firefox processes on OS X like you have. Here's a somewhat tedious process to troubleshoot this further. It may be a bad plugin or a corrupt profile.
Start Firefox in Safe Mode so you can confirm if this problem is due to any plugin or extension. If it works fine in Safe Mode, then you would have to go a bit more slowly and disable one at a time to see which one makes a difference.
You can do also use Firefox with a newly created profile. If that makes a difference, then your old profile is corrupt in some way and you could just start using this profile and add your previous extensions one by one (don't forget to copy over bookmarks from the previous profile if you decide to stick with the new one).
You can look at the crashes by going to the about:crashes page (from the address bar) and load an easy-to-read crash report that may point to issues.
Also look at the instructions and information in Firefox uses too many CPU resources - How to fix.