The interface to get `favicon` icons supports customization

[qin_xs]

Expect the interface to get favicon icons to support customization.

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Because the address <https://external-content.duckduckgo.com/ip3/[host].ico> is not accessible in my country.

Note: faviconUrl(url) method in the file modules/popup_item_list.js

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Finally, love your extension, good luck!

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