In Pale Moon 25+ the following Pale Moon Logo is visible in New Tabs, if the setting in Tools/Options/Tabs is set to a Blank Page
 

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To resolve this matter, go to Pale Moon/Tools/Options/Tabs and set new Page to Quickdial Page
The Quickdial page is equivalent to the Firefox Newtab Page
This should resolve the matter



 




Thanks to Deva for drawing attention to this solution

This has all chaged since 27.7.0 as one can set new Tab to open on Home Page !!