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How to Modify an Extension
I would like to try to modify the extension "scroll to top" or hire somebody to do it. Just to make the page up and down buttons bigger, or more space between them and the other buttons. Generally make them easier to tap. Any advice? Thanks
You're talking about this?
It doesn't appear to have a license which allows modifying the code. You can probably modify it locally for personal use though.
The easiest thing would be to make a report on the above URL and request a feature change from the developer.