open links in firejailed external browser with custom profile

[omega3]

I run RSS Guard in firejail:

program: firejail
arguments: --seccomp --private=/home/user/jail/ rssguard

How to properly configure RSS Guard option: open in external browser in the same jail?
I run:

executable file:

firejail --private=/home/user/jail/ --profile=/home/jail/.config/firejail/firefox.local /usr/lib/firefox/firefox```

parameters:

%1

and it can't open firefox.

When I do:
in executable:
firejail
and in parameters:
--private=/home/user/jail/ --profile=/home/user/jail/.config/firejail/firefox.local /usr/lib/firefox/firefox

it says it cannot open profile.

Edition:

The solution was to run rssguard with noprofile argument (or customise profile for rssguard).

firejail --seccomp --noprofile --private=/home/user/jail/ rssguard

After that in rssguard options:

program: firejail
arguments:
--private=/home/user/jail/ --profile=/home/jail/.config/firejail/firefox.local /usr/lib/firefox/firefox %1