beta version (5.1.1130.26)

[tamer]

After installing the theme, the button to open a new tab is displayed like this.

No issues with Material Incognito Dark i'm using for like ~7yrs. Have you tried to re-enable it? It was unstyled before cent completed ugrading the profile, but now it looks just fine. The only thing I noticed is the address bar that became a little larger +5px. This is particularly noticeable with --cb-compact-ui flag. Other than that I see no big changes and that's awesome!