From cold start, it takes about a minute for extension to apply dark theme to tab bar. Before that, tab bar appears with light Adwaita theme.
But on panel with extension buttons and url box, dark theme appears almost instantly.
If using Hide Tab Bar With One Tab, things are almost same. If you have only one tab, tab bar is hidden. But then you create another tab, it takes time before extension sets dark theme on tab bar.
And now, one strange thing: If you try to move or resize Firefox window, dark theme appears faster.
From cold start, it takes about a minute for extension to apply dark theme to tab bar. Before that, tab bar appears with light Adwaita theme.
But on panel with extension buttons and url box, dark theme appears almost instantly.
If using Hide Tab Bar With One Tab, things are almost same. If you have only one tab, tab bar is hidden. But then you create another tab, it takes time before extension sets dark theme on tab bar.
And now, one strange thing: If you try to move or resize Firefox window, dark theme appears faster.