bug: firefox creates a new containers.json on quite that is not overwritten

[slotThe]

Are you following the right branch?

• My Nixpkgs and Home Manager versions are in sync

Is there an existing issue for this?

• I have searched the existing issues

Issue description

When configuring firefox to use container tabs, e.g.,

programs.firfeox = {
  …
  profiles.persistent = {
    name = "persistent";
    id = 1;
    containers = {
      "foo" = {
        id    = 1;
        color = "purple";
        icon  = "chill";
      };
      …
    };
  };
}

Firefox does respect the containers, but it upon exit it sometimes seems to create the default containers.json file in its place.

$ cat /home/slot/.mozilla/firefox/persistent/containers.json
{"version":5,"lastUserContextId":5,"identities":[{"icon":"fingerprint","color":"blue","l10nId":"user-context-personal","public":true,"userContextId":1},{"icon":"briefcase","color":"orange","l10nId":"user-context-work","public":true,"userContextId":2},{"icon":"dollar","color":"green","l10nId":"user-context-banking","public":true,"userContextId":3},{"icon":"cart","color":"pink","l10nId":"user-context-shopping","public":true,"userContextId":4},{"public":false,"icon":"","color":"","name":"userContextIdInternal.thumbnail","accessKey":"","userContextId":5},{"userContextId":4294967295,"public":false,"icon":"","color":"","name":"userContextIdInternal.webextStorageLocal","accessKey":""}]}

Then on switching to a new profile I'm greeted with things like

Existing file '/home/slot/.mozilla/firefox/persistent/containers.json' is in the way of '/nix/store/pzk1y5rz7l7r8qwzkvdwswlffsnsclp0-home-manager-files/.mozilla/firefox/persistent/containers.json'

I will try to bisect this on the weekend, as this was working until very recently

Maintainer CC

@rycee @kira-bruneau

System information

console
$ nix-shell -p nix-info --run "nix-info -m"
 - system: `"x86_64-linux"`
 - host os: `Linux 6.1.75, NixOS, 24.05 (Uakari), 24.05.20240130.222c194`
 - multi-user?: `yes`
 - sandbox: `yes`
 - version: `nix-env (Nix) 2.18.1`
 - nixpkgs: `/nix/store/v9ndcychjpdnnxqdhkwj60brx6d0xaz9-source`

[codingCoffee]

Facing the same issue! @slotThe did you find any workaround for the same?

[slotThe]

@codingCoffee I opened #5057, which fixes this for me.