after firefox restart these appeared:

Feb 24 09:30:04 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  141.932834] audit: type=1400 audit(1582525804.452:27): apparmor="DENIED" operation="open" profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/proc/1888/uid_map" pid=1888 comm=495043204C61756E6368202331 requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000
Feb 24 09:30:04 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  141.934780] IPC Launch #1[1888]: segfault at 0 ip 00007fa9fe84808c sp 00007fa9f0efa780 error 6 in libxul.so[7fa9fdfac000+6f21000]
Feb 24 09:30:04 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  141.934798] Code: 75 12 89 e8 48 81 c4 10 02 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 f5 bb fc ff 48 8d 05 ae 89 85 04 48 8b 0d 57 75 c6 06 48 89 01 <c7> 04 25 00 00 00 00 1e 02 00 00 e8 ac 4a fd ff 48 8d 05 e3 89 85
Feb 24 09:30:06 dinar-HP-Pavilion-g7-Notebook-PC wpa_supplicant[826]: wlo1: CTRL-EVENT-SIGNAL-CHANGE above=0 signal=-85 noise=-95 txrate=14400
Feb 24 09:30:10 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  148.016837] audit: type=1400 audit(1582525810.536:28): apparmor="DENIED" operation="open" profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/proc/1926/uid_map" pid=1926 comm=495043204C61756E6368202331 requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000
Feb 24 09:30:10 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  148.017346] IPC Launch #1[1926]: segfault at 0 ip 00007fa9fe84808c sp 00007fa9eb29d780 error 6 in libxul.so[7fa9fdfac000+6f21000]
Feb 24 09:30:10 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  148.017359] Code: 75 12 89 e8 48 81 c4 10 02 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 f5 bb fc ff 48 8d 05 ae 89 85 04 48 8b 0d 57 75 c6 06 48 89 01 <c7> 04 25 00 00 00 00 1e 02 00 00 e8 ac 4a fd ff 48 8d 05 e3 89 85
Feb 24 09:30:11 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  148.895517] IPC Launch #1[1973]: segfault at 0 ip 00007fa9fe84808c sp 00007fa9ea5a2780 error 6 in libxul.so[7fa9fdfac000+6f21000]
Feb 24 09:30:11 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  148.895535] Code: 75 12 89 e8 48 81 c4 10 02 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 f5 bb fc ff 48 8d 05 ae 89 85 04 48 8b 0d 57 75 c6 06 48 89 01 <c7> 04 25 00 00 00 00 1e 02 00 00 e8 ac 4a fd ff 48 8d 05 e3 89 85
Feb 24 09:30:11 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  148.895594] audit: type=1400 audit(1582525811.416:29): apparmor="DENIED" operation="open" profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/proc/1973/uid_map" pid=1973 comm=495043204C61756E6368202331 requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000
Feb 24 09:30:12 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  150.432287] IPC Launch #1[1991]: segfault at 0 ip 00007fa9fe84808c sp 00007fa9fba7f780 error 6 in libxul.so[7fa9fdfac000+6f21000]
Feb 24 09:30:12 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  150.432303] Code: 75 12 89 e8 48 81 c4 10 02 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 f5 bb fc ff 48 8d 05 ae 89 85 04 48 8b 0d 57 75 c6 06 48 89 01 <c7> 04 25 00 00 00 00 1e 02 00 00 e8 ac 4a fd ff 48 8d 05 e3 89 85
Feb 24 09:30:12 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  150.432405] audit: type=1400 audit(1582525812.952:30): apparmor="DENIED" operation="open" profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/proc/1991/uid_map" pid=1991 comm=495043204C61756E6368202331 requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000
Feb 24 09:30:14 dinar-HP-Pavilion-g7-Notebook-PC wpa_supplicant[826]: wlo1: CTRL-EVENT-SIGNAL-CHANGE above=1 signal=-75 noise=-95 txrate=13000
Feb 24 09:30:14 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  152.373278] IPC Launch #1[2012]: segfault at 0 ip 00007fa9fe84808c sp 00007fa9f6fd9780 error 6 in libxul.so[7fa9fdfac000+6f21000]
Feb 24 09:30:14 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  152.373293] Code: 75 12 89 e8 48 81 c4 10 02 00 00 5b 41 5c 41 5e 41 5f 5d c3 e8 f5 bb fc ff 48 8d 05 ae 89 85 04 48 8b 0d 57 75 c6 06 48 89 01 <c7> 04 25 00 00 00 00 1e 02 00 00 e8 ac 4a fd ff 48 8d 05 e3 89 85
Feb 24 09:30:14 dinar-HP-Pavilion-g7-Notebook-PC kernel: [  152.373325] audit: type=1400 audit(1582525814.892:31): apparmor="DENIED" operation="open" profile="/usr/lib/firefox/firefox{,*[^s][^h]}" name="/proc/2012/uid_map" pid=2012 comm=495043204C61756E6368202331 requested_mask="w" denied_mask="w" fsuid=1000 ouid=1000

and i have seen some suspicious things, for that i commented out those capability rules.

also, there were problems, in addition to the new messages: firefox said {ff has been updated, you must restart it} on every tab, if i open them, and then after restarting, content of that tabs were lost. one of them has put ubuntu.com at address bar, another become blank.