I copied the crash report that is sent to Apple. It is a 500+ page Word document.

Is it the browser that is crashing or your system?

If the browser:

Start Firefox using Troubleshoot(Safe) Mode {web link}

A small dialog should appear. Click Start In Troubleshoot(Safe) Mode (not Refresh). Is the problem still there?

While still in Troubleshoot(Safe) Mode,

In the address bar, type about:crashes<enter>. Note: If any reports do not have BP- in front of the numbers/letters, click it to submit them.

The crash report is several pages of data. We need the report numbers to see the whole report.

Using your mouse, mark the most recent 7 - 10 Submitted crash reports, and copy them. Now go to the reply box and paste them in.

Please, Do not post a screenshot ! !

For more help on crash reports, see; https://support.mozilla.org/en-US/kb/firefox-crashes-asking-support +++++++++++++++++++++++++++ If you can't get Firefox to open, you will have to do this the hard way. https://support.mozilla.org/en-US/kb/mozillacrashreporter

Open the file browser / explorer on your computer. Note: You may have to enable Show Hidden Folders / Files. Enter this in the address bar;

Windows: %APPDATA%\Mozilla\Firefox\Crash Reports\submitted Win 7/Vista: C:\Users\<username>\AppData\Roaming\Mozilla\Firefox\Crash Reports\submitted Win XP/2000: C:\Documents and Settings\<username>\Application Data\Mozilla\Firefox\Crash Reports\submitted Win 10: Press <Windows> + R on the keyboard. A Run dialog will open. In the Run dialog, type %APPDATA%\Mozilla\Firefox\Crash Reports\submitted <Enter>

Mac OS: /Users/<username>/Library/Application Support/Firefox/Crash Reports/submitted Linux: /home/<username>/.mozilla/firefox/Crash Reports/submitted

Copy the most Recent 5-7 File Names in the folder. Press the Reply button. Now go to the reply box and paste them in.

It is Firefox that freezes and becomes unresponsive, not the system.

When starting FF in safe mode, it still freezes so can't to anything but force quit.

There are no reports in the Crash Reports folder.

Anything else to do? Otherwise, I will keep using the prior version. Eventually, I hope that a FF update or MacOS update will fix this.

Start your Computer in safe mode with network support. Then start Firefox. Try Secure websites. Is the problem still there?

Starting Any Computer In Safe Mode (web link) Free Online Encyclopedia

https://www.bleepingcomputer.com/tutorials/how-to-start-windows-in-safe-mode/

https://www.digitalcitizen.life/4-ways-boot-safe-mode-windows-10/ +++++++++++++++++++++++++++++++++++++++++++++++ If the problem goes away with the computer in Safe Mode, the problem is with one of the other programs on the system.

As a test, disable your protection programs.

It is a 500+ page Word document.

Can you let us see what is in this? Not the whole 500. Just the first few.

First 3 pages:

Date/Time: 2021-08-29 11:22:50.617 -0400 End time: 2021-08-29 11:23:12.676 -0400 OS Version: macOS 11.5.2 (Build 20G95) Architecture: x86_64h Report Version: 32

Data Source: Stackshots Shared Cache: 0C9EB0DE-F5CE-3AFC-8F08-0C6DB1E7FC44 slid base address 0x7fff201cf000, slide 0x1cf000

Command: firefox Path: /Applications/Firefox.app/Contents/MacOS/firefox Identifier: org.mozilla.firefox Version: 91.0.2 (9121.8.23) Parent: launchd [1] PID: 928 Time Since Fork: 36s

Event: hang Duration: 22.06s Duration Sampled: 1.00s (process was unresponsive for 21 seconds before sampling) Steps: 10 (100ms sampling interval)

Hardware model: iMac19,2 Active cpus: 4

Time Awake Since Boot: 278s Time Since Wake: n/a (machine hasn't slept)

Fan speed: 1198 rpm

Timeline format: stacks are sorted chronologically Use -i and -heavy to re-report with count sorting

Heaviest stack for the main thread of the target process:

 10  PR_Lock + 9 (libnss3.dylib + 852409) [0x1103d01b9]
 10  _pthread_mutex_firstfit_lock_slow + 204 (libsystem_pthread.dylib + 8594) [0x7fff204d9192]
 10  __psynch_mutexwait + 10 (libsystem_kernel.dylib + 13514) [0x7fff204aa4ca]
*10  psynch_mtxcontinue + 0 (pthread + 11907) [0xffffff80035e7e83]

Process: firefox (Firefox) [928] UUID: A31256BE-9A2C-3EBB-BE1C-8CFD2A35727C App Version: 91.0.2 Build Version: 9121.8.23 Path: /Applications/Firefox.app/Contents/MacOS/firefox Architecture: x86_64 Parent: launchd [1] UID: 501 Footprint: 270.17 MB Time Since Fork: 36s Num samples: 10 (1-10) CPU Time: 0.004s (14.3M cycles, 5.7M instructions, 2.50c/i) Note: Unresponsive for 21 seconds before sampling Note: 3 idle work queue threads omitted

 Thread 0x3406    DispatchQueue "com.apple.main-thread"(1)    Thread name "MainThread"    10 samples (1-10)    priority 47 (base 47)
 <process frontmost, thread QoS user interactive (requested user interactive), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  PR_Lock + 9 (libnss3.dylib + 852409) [0x1103d01b9] 1-10
   10  _pthread_mutex_firstfit_lock_slow + 204 (libsystem_pthread.dylib + 8594) [0x7fff204d9192] 1-10
     10  __psynch_mutexwait + 10 (libsystem_kernel.dylib + 13514) [0x7fff204aa4ca] 1-10
      *10  psynch_mtxcontinue + 0 (pthread + 11907) [0xffffff80035e7e83] (blocked by turnstile waiting for firefox (Firefox) [928] thread 0x3530) 1-10

 Thread 0x341a    Thread name "Breakpad ExceptionHandler"    10 samples (1-10)    priority 31 (base 31)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  thread_start + 15 (libsystem_pthread.dylib + 9283) [0x7fff204d9443] 1-10
   10  ??? (XUL + 23165973) [0x111b9bc15] 1-10
     10  mach_msg_trap + 10 (libsystem_kernel.dylib + 4794) [0x7fff204a82ba] 1-10
      *10  ipc_mqueue_receive_continue + 0 (kernel + 389472) [0xffffff800026f160] 1-10

 Thread 0x3428    Thread name "IPC I/O Parent"    10 samples (1-10)    priority 31 (base 31)    cpu time <0.001s (3.5M cycles, 1063.5K instructions, 3.25c/i)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  <truncated backtrace> 1-10
   10  kevent + 10 (libsystem_kernel.dylib + 23626) [0x7fff204acc4a] 1-10
    *10  ??? (kernel + 6222640) [0xffffff80007ff330] 1-10

 Thread 0x3429    Thread name "Timer"    10 samples (1-10)    priority 31 (base 31)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  mozilla::detail::ConditionVariableImpl::wait_for(mozilla::detail::MutexImpl&, mozilla::BaseTimeDuration<mozilla::TimeDurationValueCalculator> const&) + 240 (libmozglue.dylib + 91232) [0x10ffb5460] 1-10
   10  __psynch_cvwait + 10 (libsystem_kernel.dylib + 15582) [0x7fff204aacde] 1-10
    *10  psynch_cvcontinue + 0 (pthread + 21269) [0xffffff80035ea315] 1-10

 Thread 0x342c    Thread name "Socket Thread"    10 samples (1-10)    priority 31 (base 31)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  PR_Lock + 9 (libnss3.dylib + 852409) [0x1103d01b9] 1-10
   10  _pthread_mutex_firstfit_lock_slow + 204 (libsystem_pthread.dylib + 8594) [0x7fff204d9192] 1-10
     10  __psynch_mutexwait + 10 (libsystem_kernel.dylib + 13514) [0x7fff204aa4ca] 1-10
      *10  psynch_mtxcontinue + 0 (pthread + 11907) [0xffffff80035e7e83] (blocked by turnstile with priority 47 waiting for firefox (Firefox) [928] thread 0x3530) 1-10

 Thread 0x342d    Thread name "Permission"    10 samples (1-10)    priority 31 (base 31)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  mozilla::detail::ConditionVariableImpl::wait(mozilla::detail::MutexImpl&) + 6 (libmozglue.dylib + 90950) [0x10ffb5346] 1-10
   10  __psynch_cvwait + 10 (libsystem_kernel.dylib + 15582) [0x7fff204aacde] 1-10
    *10  psynch_cvcontinue + 0 (pthread + 21269) [0xffffff80035ea315] 1-10

 Thread 0x342f    Thread name "JS Watchdog"    10 samples (1-10)    priority 31 (base 31)    cpu time <0.001s (182.7K cycles, 28.0K instructions, 6.52c/i)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  PR_WaitCondVar + 270 (libnss3.dylib + 864798) [0x1103d321e] 1-10
   10  __psynch_cvwait + 10 (libsystem_kernel.dylib + 15582) [0x7fff204aacde] 1-10
    *10  psynch_cvcontinue + 0 (pthread + 21269) [0xffffff80035ea315] 1-10

 Thread 0x3434    Thread name "TaskController Thread #0"    10 samples (1-10)    priority 31 (base 31)
 <process frontmost, thread QoS default (requested default), process unclamped, process received importance donation from WindowServer [130], IO tier 0>
 10  mozilla::detail::ConditionVariableImpl::wait(mozilla::detail::MutexImpl&) + 6 (libmozglue.dylib + 90950) [0x10ffb5346] 1-10
   10  __psynch_cvwait + 10 (libsystem_kernel.dylib + 15582) [0x7fff204aacde] 1-10
    *10  psynch_cvcontinue + 0 (pthread + 21269) [0xffffff80035ea315] 1-10

I called for more help.