So I have clean installed KDE neon and I have a weird problem. I added in the pre-installed Firefox browser the plasma-browser-integration extension and it doesn't work. I get the message "Failed to connect to the native host". I checked if it was installed and the package 'plasma-browser-integration' is there. Why Firefox can't locate it? I asked at the firefox help forum and they stated that it isn't a browser problem. Please help!
I use: KDE neon 5.27
KDE plasma version: 5.27.3
Firefox edition 111.0, Mozilla Firefox for Ubuntu
Thanks in advance!

On some systems, it seems that the apparmor profile for FF causes some extensions to not be able to connect to a native host.

This can be remedied, or disabled, rather, like so:

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sudo ln -s /etc/apparmor.d/usr.bin.firefox /etc/apparmor.d/disable/
sudo apparmor_parser -R /etc/apparmor.d/usr.bin.firefox

SOURCE
I assume that the Mozillateam PPA folks may need to be poked on the topic as the profile comes from their Firefox packaging, but not sure where to do so.

YESSS!!!! Thanks mate it worked like a charm! You are the BEST! You got no ideas how long i've been trying and you solve it in a single reply! Awesome!!

Hi
I have a similar issue but this fix doesn't work for me.
I'm running Kubuntu 22.10
Firefox 111.0.1 Mozzilla Snap for Ubuntu - cannonical-002- 1.0
Latest plasma-browser-integration
Kernel 5-19.0-38-generic

When I run these two commands I get :-
ln: failed to create symbolic link '/etc/apparmor.d/disable/usr.bin.firefox': File exists
and :-
apparmor_parser: Unable to remove "firefox". Profile doesn't exist

What am I doing wrong or how can I create a firefox profile please?

paulburden wrote:Hi
I have a similar issue but this fix doesn't work for me.
I'm running Kubuntu 22.10
Firefox 111.0.1 Mozzilla Snap for Ubuntu - cannonical-002- 1.0
Latest plasma-browser-integration
Kernel 5-19.0-38-generic

When I run these two commands I get :-
ln: failed to create symbolic link '/etc/apparmor.d/disable/usr.bin.firefox': File exists
and :-
apparmor_parser: Unable to remove "firefox". Profile doesn't exist

What am I doing wrong or how can I create a firefox profile please?

You are using the Firefox snap, which had this issue fixed some time ago now, so you have a different issue than the one here from the PPA deb packaging neon uses for FF. You will need to pester the snap folk, I imagine.

I have the same problem as the previous writer getting the same replies when running those commands.

The problem is that I have no snap or flatpak apps on my system.
I dont use Discover but it shows 'Firefox and Thunderbird Archive' ( distributed by KDE Neon ) as installed.

The upgrade to 5.27 seems to have brought several problems with it after years of faultless improvements.

jmacleod wrote:I have the same problem as the previous writer getting the same replies when running those commands.

The problem is that I have no snap or flatpak apps on my system.
I dont use Discover but it shows 'Firefox and Thunderbird Archive' ( distributed by KDE Neon ) as installed.

The upgrade to 5.27 seems to have brought several problems with it after years of faultless improvements.

It could be an issues with your combo of extensions, or some other issue with one's FF profile?
I am on neon as well, and have no issues with Plasma Browser Integration, after following those steps I listed above. This disables the apparmor profile, which is what was causing the problem.



No issues for quite some time now, either.

If you want to try re-enabling it for some reason, you need to do the opposite:

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sudo rm /etc/apparmor.d/disable/usr.bin.firefox
sudo apparmor_parser -r /etc/apparmor.d/usr.bin.firefox

For me, re-enabling the apparmor profile re-breaks the plasma-browser-extension, as well as another one I use that also uses a native host integration.

Isn't there a way to fix the profile without disabling AppArmor for Firefox completely?
With the browser being the most common route into a machine for hackers, disabling AppArmor for it sounds pretty dangerous...

I found another solution. In the application launcher menu, right-click on Firefox, click Edit Application..., click on the Application tab and add this to the Environment Variables field:

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GTK_USE_PORTAL=1

Note that after editing, the icon in the Favorites will no longer work to start Firefox, so this icon needs to be deleted from Favorites, and re-added from where it is on the menu (in other words, under Internet).

This procedure may work for other GTK applications that use the GTK file dialogs, for example I did it for GVim, which as installed used the GTK file dialogs. After this procedure, it now uses the KDE file dialogs.

Thanks!
This fixes the file dialog. That's not the only feature of the Plasma Browser Integration add-on, though.
So I'd still hope for a solution that makes it work without completely disabling App Armor for Firefox