Simplistic but if you literally just need an app that'll get you the hexcode of something on your browser, this does the trick and doesn't suck like some others do :)

Simple color picker, all I need. At least I can ditch the application I had to install from the Microsoft Store now.

after trying a dozen, this was the only extension that could pick hexcode from a website successfully.

This extension does technically work. However, it seems unfinished. When I use it to identify a color on a webpage, it first gives me a series of three popups that seem to be in place for debugging purposes. After I close each popup, I am able to see the hex code for the color I picked. When I dismiss the hex code, I see the same three debugging popups again. This is obnoxious and makes me not want to use the extension.

Additionally confusing - the extension's logo once installed is different from the logo on this page, which does not inspire confidence.