Problem with firefox 89 after update

From: AN <andy_at_neu.net>
Date: Wed, 26 May 2021 00:28:47 UTC
Hi:

I am seeing a problem with Firefox89, that I did not see before.  The
following process is using too much CPU:

28907 root         99    0    14G  9387M CPU12   12 107:28  99.59%
firefox{Renderer}


FreeBSD Free_BSD_13 13.0-STABLE FreeBSD 13.0-STABLE #11
stable/13-n245760-b14db362bbd: Tue May 25 13:50:14 EDT 2021
root@Free_BSD_13:/usr/obj/usr/src/amd64.amd64/sys/MYKERNEL  amd64 1300505

from top:

Mem: 7405M Active, 11G Inact, 535M Laundry, 3920M Wired, 1350M Buf, 590M
Free
Swap: 24G Total, 24G Free

  PID USERNAME    PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
   11 root        155 ki31     0B   256K CPU7     7 238:07  98.90%
[idle{idle: cpu7}]
   11 root        155 ki31     0B   256K CPU3     3 243:32  98.59%
[idle{idle: cpu3}]
   11 root        155 ki31     0B   256K CPU6     6 238:03  98.34%
[idle{idle: cpu6}]
   11 root        155 ki31     0B   256K RUN     15 232:23  97.41%
[idle{idle: cpu15}]
   11 root        155 ki31     0B   256K CPU0     0 237:15  97.36%
[idle{idle: cpu0}]
   11 root        155 ki31     0B   256K CPU5     5 238:12  96.83%
[idle{idle: cpu5}]
   11 root        155 ki31     0B   256K CPU14   14 231:56  96.78%
[idle{idle: cpu14}]
   11 root        155 ki31     0B   256K CPU10   10 231:38  96.76%
[idle{idle: cpu10}]
   11 root        155 ki31     0B   256K CPU4     4 237:56  95.44%
[idle{idle: cpu4}]
   11 root        155 ki31     0B   256K RUN      1 238:27  94.24%
[idle{idle: cpu1}]
   11 root        155 ki31     0B   256K CPU2     2 237:15  94.21%
[idle{idle: cpu2}]
   11 root        155 ki31     0B   256K CPU13   13 232:22  91.42%
[idle{idle: cpu13}]
   11 root        155 ki31     0B   256K CPU9     9 232:27  89.44%
[idle{idle: cpu9}]
   11 root        155 ki31     0B   256K CPU12   12 231:27  88.36%
[idle{idle: cpu12}]
   11 root        155 ki31     0B   256K CPU11   11 230:44  87.07%
[idle{idle: cpu11}]
   11 root        155 ki31     0B   256K CPU8     8 230:30  71.88%
[idle{idle: cpu8}]
28907 root         94    0    14G  9356M CPU15   15  93:03  68.42%
firefox{Renderer}
   12 root        -96    -     0B   512K WAIT     2   6:30   4.73%
[intr{irq62: vgapci0}]
28907 root         21    0    14G  9356M select   8   4:52   3.72%
firefox{MainThread}
32097 root         22    0  3634M   939M select   5   5:47   3.59%
/usr/local/lib/firefox/firefox -contentproc -childID 4 -isForBrowser -
32394 root         21    0  3663M   982M select   2   3:36   3.18%
/usr/local/lib/firefox/firefox -contentproc -childID 5 -isForBrowser -
 4878 root         22   -1  6553M   103M select  11  42:33   2.49%
/usr/local/bin/Xorg :0 -auth /root/.serverauth.97825{MainThread}
53145 root         20    0    14M  4316K select   1   0:50   1.40% systat
-v
28907 root         20    0    14G  9356M uwait   12   0:56   1.20%
firefox{WRRenderBackend#33}
30397 root         20    0  4884M  2114M select   2   2:26   0.95%
/usr/local/lib/firefox/firefox -contentproc -childID 1 -isForBrowser -
34633 root         20    0  9975M  1321M select   4   2:01   0.94%
/usr/local/lib/firefox/firefox -contentproc -childID 9 -isForBrowser -
28907 root         20    0    14G  9356M kqread  11   1:04   0.92%
firefox{IPC I/O Parent}
28907 root         20    0    14G  9356M uwait   12   1:32   0.91%
firefox{WRSceneBuilder#12}
28907 root         20    0    14G  9356M uwait   14   0:42   0.84%
firefox{WRRenderBackend#25}
32585 root         20    0   141M    74M select   6  30:48   0.82% compiz
--replace --sm-disable --ignore-desktop-hints ccp{compiz}
28907 root         20    0    14G  9356M uwait    1   0:37   0.75%
firefox{WRSceneBuilder#29}
31130 root         20    0  3565M   869M select  10   1:34   0.71%
/usr/local/lib/firefox/firefox -contentproc -childID 2 -isForBrowser -
31622 root         20    0  3557M   856M select   6   1:01   0.65%
/usr/local/lib/firefox/firefox -contentproc -childID 3 -isForBrowser -
28907 root         20    0    14G  9356M select  13   0:37   0.64%
firefox{GLXVsyncThread}
33223 root         20    0  3587M   860M select   2   1:21   0.57%
/usr/local/lib/firefox/firefox -contentproc -childID 6 -isForBrowser -
34620 root         20    0  3525M   941M select  11   1:18   0.54%
/usr/local/lib/firefox/firefox -contentproc -childID 8 -isForBrowser -
33773 root         20    0  3223M   611M select   4   0:44   0.51%
/usr/local/lib/firefox/firefox -contentproc -childID 7 -isForBrowser -
28907 root         20    0    14G  9356M uwait    5   0:34   0.47%
firefox{Compositor}
 7872 root         20    0   136M    67M select   5   1:38   0.44%
mate-terminal{mate-terminal}
28907 root         20    0    14G  9356M uwait   11   0:34   0.36%
firefox{WRRenderBackend#12}
34633 root         20    0  9975M  1321M kqread  10   0:16   0.35%
/usr/local/lib/firefox/firefox -contentproc -childID 9 -isForBrowser -
32394 root         20    0  3663M   982M kqread   5   0:15   0.26%
/usr/local/lib/firefox/firefox -contentproc -childID 5 -isForBrowser -
28907 root         20    0    14G  9356M uwait   13   0:15   0.26%
firefox{WRRenderBackend#29}
32097 root         20    0  3634M   939M kqread  11   0:21   0.25%
/usr/local/lib/firefox/firefox -contentproc -childID 4 -isForBrowser -
28907 root         20    0    14G  9356M uwait    1   0:17   0.22%
firefox{IPDL Background}

Is anyone else seeing this behavior?