Thunderbird firefox polices issue

DocBrown101 · July 27, 2026, 10:57am

There’s already a bug ticket for this:

firefox: UI renders no text

offen 07:17AM - 27 Jul 26 UTC

0.kind: bug

### Nixpkgs version - Stable (26.05) ### Describe the bug After a routine `ni…xos-26.05` update, Firefox renders no text in its chrome UI — tab titles, toolbar, and menus are blank — while web **page content** renders text normally. Thunderbird (which seems to share the Firefox wrapper) is affected the same way: menus, folder pane, and dialog text are blank. I'm on KDE Plasma 6 (Wayland). ### Steps to reproduce 1. On KDE Plasma (Wayland), `nixos-26.05`, update nixpkgs to a revision that includes the recent `firefox/wrapper` changes. 2. Launch Firefox (or Thunderbird). 3. Observe: chrome/UI text is blank; web page content still shows text. ### Expected behaviour Firefox and Thunderbird should render text correctly without having to setup environment variables. ### Screenshots _No response_ ### Relevant log output ```console ``` ### Additional context ### What I found - `firefox-unwrapped` is byte-identical across the working and broken revisions; only the wrapper differs. - In the working build, the Firefox wrapper adds `gsettings-desktop-schemas` and `gtk3` gsettings-schemas to `XDG_DATA_DIRS`. In the broken build, those entries are gone from the wrapper. - My Plasma session does not provide those schemas on `XDG_DATA_DIRS` otherwise, so on this setup they only ever reached the app via the wrapper. - Manually adding those two schema directories back to `XDG_DATA_DIRS` when launching the broken build makes the UI text render correctly again (tested for both Firefox and Thunderbird). I noticed the commit `firefox/wrapper: enable strictDeps` (#540042, backported in #545437) landed in the update window that introduced this for me. I'm not certain it's the cause, but it seemed possibly related since it changes how the wrapper's dependencies are handled. ### Workaround Providing the schemas at the session level restores the text. On NixOS: ```nix environment.sessionVariables.XDG_DATA_DIRS = [ "${pkgs.gsettings-desktop-schemas}/share/gsettings-schemas/${pkgs.gsettings-desktop-schemas.name}" "${pkgs.gtk3}/share/gsettings-schemas/${pkgs.gtk3.name}" ]; ``` ### AI disclosure AI help was used in troubleshooting and creating a workaround, but a real human (me) is filing this issue. ### System metadata - system: `"x86_64-linux"` - host os: `Linux 6.18.40, NixOS, 26.05 (Yarara), 26.05.20260725.f7a2e42` - multi-user?: `yes` - sandbox: `yes` - version: `nix-env (Nix) 2.34.8` - nixpkgs: `/nix/store/xsgr0jkfd5115cvzvh5lqzjnv0bjvwwq-source` ### Notify maintainers @booxter @mweinelt --- **Note for maintainers:** Please tag this issue in your pull request description. (i.e. `Resolves #ISSUE`.) ### I assert that this issue is relevant for Nixpkgs - [x] I assert that this is a bug and not a support request. - [x] I assert that this is not a [duplicate of an existing issue](https://github.com/NixOS/nixpkgs/issues?q=is%3Aissue+label%3A%220.kind%3A+bug%22+-label%3A%226.topic%3A+darwin%22+-label%3A%226.topic%3A+nixos%22). - [x] I assert that I have read the [NixOS Code of Conduct](https://github.com/NixOS/.github/blob/master/CODE_OF_CONDUCT.md) and agree to abide by it. - [x] I assert that I have read the [automation/AI policy](https://github.com/NixOS/nixpkgs/blob/master/CONTRIBUTING.md#automationai-policy) and that this issue report complies with it. ### Is this issue important to you? Add a :+1: [reaction] to [issues you find important]. [reaction]: https://github.blog/2016-03-10-add-reactions-to-pull-requests-issues-and-comments/ [issues you find important]: https://github.com/NixOS/nixpkgs/issues?q=is%3Aissue+is%3Aopen+sort%3Areactions-%2B1-desc