When other than gnome-shell environment is run, Firefox gets wrong colors from css styles.

The attached patch fixes it because reloads the theme, but it's that a correct solution?

char *theme;
GtkSettings *settings = gtk_settings_get_default();
g_object_get (settings,
              "gtk-theme-name", &theme,
               nullptr);

GtkCssProvider *provider = gtk_css_provider_get_named(theme, NULL);
GdkScreen *screen = gdk_screen_get_default();
gtk_style_context_add_provider_for_screen(screen,
                                          GTK_STYLE_PROVIDER(provider),
                                          GTK_STYLE_PROVIDER_PRIORITY_USER);