Is this with the Mac system, or the Ubuntu, or both?

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

I'm only using Ubuntu (18.04.05) on my mac, if this was the question

Would you recommend to downgrade my firefox version with synaptic?

Let's find out what the problem is first. What about the crash report listings?

Sorry, what do you mean with "crash report listings"? I've posted one report above, here is another one which I got from /mozilla/firefox/Crash Reports/pending

{"AdapterDeviceID":"0x0166","AdapterDriverVendor":"mesa/i965","AdapterDriverVersion":"20.0.8.0","AdapterVendorID":"0x8086","AvailablePageFile":"0","AvailablePhysicalMemory":"7841894400","AvailableSwapMemory":"1027600384","AvailableVirtualMemory":"13058576384","BuildID":"20210222142601","CrashTime":"1614969014","DesktopEnvironment":"gnome","FramePoisonBase":"9223372036600930304","FramePoisonSize":"4096","InstallTime":"1614674339","IsWayland":"0","IsWaylandDRM":"0","MozCrashReason":"OOB","Notes":"Ubuntu 18.04.5 LTSFP(D00-L1000-W00000000-T000) WR? WR+ OMTP? OMTP+3 libGL.so.1? libGL.so.1+ ","ProductID":"{ec8030f7-c20a-464f-9b0e-13a3a9e97384}","ProductName":"Firefox","ReleaseChannel":"release","SafeMode":"0","SecondsSinceLastCrash":"807","ServerURL":"https://crash-reports.mozilla.com/submit?id={ec8030f7-c20a-464f-9b0e-13a3a9e97384}&version=86.0&buildid=20210222142601","StackTraces":{"crash_info":{"address":"0","crashing_thread":0,"type":"SIGSEGV /SEGV_MAPERR"},"modules":[{"base_addr":"0x7fdc7b273000","code_id":"1e756486b2b98ce1a7aaf89f21df80a87ae917ae","debug_file":"libxul.so","debug_id":"8664751EB9B2E18CA7AAF89F21DF80A80","end_addr":"0x7fdc837f2000","filename":"libxul.so","version":""}],"status":"OK","threads":[{"frames":[{"ip":"0x7fdc80d22a0b","module_index":0,"trust":"context"},{"ip":"0x7fdc8011ea7e","module_index":0,"trust":"scan"}]}]},"StartupCrash":"1","StartupTime":"1614969013","TelemetrySessionId":"b157f898-3bf9-4161-be8a-ad77ae582441","ThreadIdNameMapping":"17072:\"IPC I/O Parent\",17073:\"Timer\",17074:\"Netlink Monitor\",17075:\"Socket Thread\",17076:\"Permission\",17079:\"JS Watchdog\",17080:\"JS Helper\",17082:\"JS Helper\",17081:\"JS Helper\",17083:\"JS Helper\",17084:\"BGReadURLs\",17085:\"Cache2 I/O\",17086:\"Cookie\",17087:\"StreamTrans #1\",17088:\"Worker Launcher\",17093:\"GLXVsyncThread\",17098:\"Renderer\",17099:\"WRWorker#0\",17100:\"WRWorker#1\",17101:\"WRWorker#2\",17102:\"WRWorker#3\",17103:\"WRWorkerLP#0\",17104:\"WRWorkerLP#1\",17107:\"Compositor\",17105:\"WRWorkerLP#2\",17106:\"WRWorkerLP#3\",","TotalPageFile":"17749499904","TotalPhysicalMemory":"16721899520","UptimeTS":".61921529","Vendor":"Mozilla","Version":"86.0"}

I found another user (also Ubuntu 18.04, with the same problem, and the same crash report). So it could be a broader issue. And whats interesting is, this person is also using a MacbookPro2012. Maybee with this combination something went wrong. But at this point I have no clue what to do and how to fix.

https://bugzilla.mozilla.org/show_bug.cgi?id=1421657

Update:

I updated Ubuntu to 20.04.2, the problem with firefox still persists

If you have submitted crash reports, please post the IDs of one or more recent crash reports that start with "bp-".

• bp-xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx

You can find the report ID of recent crash reports on the "Help -> Troubleshooting Information" (about:support) page.

• click the "All Crash Reports" button on this page to open the about:crashes page and see all crash reports.

Alternatively you can open about:crashes via the location/address bar.

See also:

• https://support.mozilla.org/en-US/kb/mozillacrashreporter

This should be the Crash ID of the most recent submitted crash report.

Crash ID: bp-8db9bb86-1d3b-45e0-b4ab-b03640210306

This is a problem with the color profile of your display monitor that is either too large (OOB) or incompatible with Firefox.

There is a bug report about this issue, fixed for 88 and approved for 87.0b3 (current beta should have it).

• Bug 1694670 - Linux startup crash in [@ qcms_data_create_rgb_with_gamma]

(please do not comment in bug reports
https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)