In my (Manjaro) Linux, in the directory
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/usr/lib/palemoon/browser/chrome/icons/default/
Download any icons (with copy rights) or create yours, place them in any directory and from that directory copy them to PM directory:
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sudo cp default16.png /usr/lib/palemoon/browser/chrome/icons/default/default16.png
sudo cp default32.png /usr/lib/palemoon/browser/chrome/icons/default/default32.png
sudo cp default48.png /usr/lib/palemoon/browser/chrome/icons/default/default48.png