In a private window the urlbar field has a different background colour than the rest of the one-liner navbar. The same visual also shows up in a regular window when opening a new tab and displaying the bookmarks there: the urlbar reads like a tab attached to the main window – identical in appearance to #38.
Environment: FF 153 (Nova enabled), FoxOne 3.4.9, Windows 11.
Suspected mechanism: FoxOne paints the urlbar field via --toolbar-field-background-color (falling back to --lwt-accent-color under a dynamic theme, see the field-tone rules from #28). Firefox's built-in private-browsing theme acts like a dynamic/lwt theme and overrides these variables, so the field tone diverges from FoxOne's navbar background – the same variable path that breaks with Adaptive-Tab-Bar-Colour in #38. Unverified, needs a Browser Toolbox check against a private window.
Possibly related: #38.

In a private window the urlbar field has a different background colour than the rest of the one-liner navbar. The same visual also shows up in a regular window when opening a new tab and displaying the bookmarks there: the urlbar reads like a tab attached to the main window – identical in appearance to #38.
Environment: FF 153 (Nova enabled), FoxOne 3.4.9, Windows 11.
Suspected mechanism: FoxOne paints the urlbar field via
--toolbar-field-background-color(falling back to--lwt-accent-colorunder a dynamic theme, see the field-tone rules from #28). Firefox's built-in private-browsing theme acts like a dynamic/lwt theme and overrides these variables, so the field tone diverges from FoxOne's navbar background – the same variable path that breaks with Adaptive-Tab-Bar-Colour in #38. Unverified, needs a Browser Toolbox check against a private window.Possibly related: #38.