Show tippy on selected text of other webpages

[kqvanity]

Problem

Tippy.js is limited to showing the popover only at a predefined element, but I want to display it dynamically at any selected text of other 3rd-party websites that I have no control over its structure.

Solution

A way to show the popover when a certain text is selected, and preferably with some form of callback to obtain the text itself rather than relying on additional API.