[Bug 2080432] [NEW] Users can not save files in /run/user/1000 (or /run/user/ID_USER)

[Ganton]

Public bug reported:

Problem: At least since Firefox 130 (snap version), users can not save
files in /run/user/1000 (or /run/user/ID_USER).

Note: That folder is used because, for example, what is saved there is
not saved to disk (e.g. due to confidentiality reasons), and
[applications looking to store their files locally no longer have to
worry about access control](https://unix.stackexchange.com/a/162911).

$ lsb_release -rd
No LSB modules are available.
Description:    Ubuntu 24.04.1 LTS
Release:        24.04

$ snap list firefox
Nombre   Versión  Rev   Seguimiento      Editor    Notas
firefox  130.0-2  4848  latest/stable/…  mozilla✓  -

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Problem: At least since Firefox 130 (snap version), users can not save
  files in /run/user/1000 (or /run/user/ID_USER).
  
  Note: That folder is used because, for example, what is saved there is
- not saved to disk, and [applications looking to store their files
- locally no longer have to worry about access
- control](https://unix.stackexchange.com/a/162911).
+ not saved to disk (e.g. due to confidentiality reasons), and
+ [applications looking to store their files locally no longer have to
+ worry about access control](https://unix.stackexchange.com/a/162911).
  
  $ lsb_release -rd
  No LSB modules are available.
  Description:    Ubuntu 24.04.1 LTS
  Release:        24.04
  
  $ snap list firefox
  Nombre   Versión  Rev   Seguimiento      Editor    Notas
  firefox  130.0-2  4848  latest/stable/…  mozilla✓  -

-- 
You received this bug notification because you are a member of Mozilla
Bugs, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/2080432

Title:
  Users can not save files in /run/user/1000 (or /run/user/ID_USER)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/firefox/+bug/2080432/+subscriptions