Help in LibreOffice not functioning

Just installed version 24.8.2.1 on Xubuntu 22.04 When I want to use help Firefox tells me: file /opt/libreoffice24.8/help/index.html?Target=swriter/sfx/ui/startcenter/StartCenter&Language=nl&System=UNIX&Version=24.8 cannot be found
What is wrong? Please help.

You must install the offline HELP files (the localized helps) individually.

Hi, I installed my language support as well as the localized help files.

apt ?
deb ?

Snap ?? (4321 - Need 10 chars to comment)
.
UPDATE:
Maybe compare here:

@ fpy: I used $ sudo dpkg -i *.deb
@ Wanderer: Not snap.
I see on another system with Xubuntu 22.04 and LibreOffice 24.2 that help functions as should. It is not installed in /opt
In my working computer with Xubuntu 22.04 and LibreOffice 24.8 LO is installed in /usr/

so you have an obvious mismatch :

are your .deb from the same source ? same version ?

Check the link I posted above: The problem seemed to be not LibreOffice as snap but the default browser as snap (or the rights this container has). Check, if switching to an installed default browser helps. If not you can purge it again…

Thanks for the help. It seemed that Firefox is snap and LO is deb and the problem is Firefox. Perhaps I can install the deb-version of Firefox.

Found the solution. LO as well as Firefox should be installed woth deb. I followed:

LO was installed via PPA.