Firefox snap cannot open files in Samba share

[James Seiters]

I have a Samba share that is mounted by SMB4K. All of the other apps on my system can open the HTML files stored there except Firefox. When I try to open a file I get a Access to the file was denied error page in Firefox. The system log reports:
kernel: audit: type=1400 audit(1714687117.353:184): apparmor="DENIED" operation="open" class="file" profile="snap.firefox.firefox" name=2F686F6D652F6A736569746572732F736D62346B2F4F4653414D425345525630303030312F4E6164656E652F576F726B2F53656C662D5075626C697368696E672047656E69652F4A6F62732F4546412F4B6576696E204D6347617272792F46696E616C20446F63756D656E74732F455055422F636861707465725F312E68746D6C pid=2939 comm=53747265616D5472616E7320233430 requested_mask="r" denied_mask="r" fsuid=1000 ouid=0

The user and group on the mounted directory is root. This is a new issue that started to occur in kubuntu 23.10. I am currently running kubuntu 24.04 and still getting this error. Previously I was able to view these files.

My lsb_release -rd:
o LSB modules are available.
Description: Ubuntu 24.04 LTS
Release: 24.04

What I expect to happen:
Firefox should open the HTML files on the mounted Samba share.
What does happen:
I get the access denied error page.

[James Seiters (cichlasoma)]

Forgot to mention the share is mounted under my home directory.

[James Seiters (cichlasoma)]

I have fixed the share permissions after filling a bug report with the SMB4K maintainers and Firefox works with the changed permissions.

I am still curious if not being able to open files owned by root in a user's home directory is expected behavior for snap applications. The exact permissions were:

-rwxr-xr-x 1 root root 2301 Apr 29 09:09 about.html*

I can open the file with a non-snap app such as Kate.