CIENFUEGOS Palette by Karen Contreras Cubas

CIENFUEGOS Palette reads the colour of any pixel on the page you are looking at and
copies the value to your clipboard.

It asks for no access to any website.

Most colour pickers request permission to access your data for all websites,
because they inject a script into every page you visit in order to read pixels.
CIENFUEGOS Palette injects nothing. It captures a single frame of the tab you are on,
only after you click its button, and reads the pixel from that image.

The result is an extension that installs without a host-permission prompt and
still works on pages where script-injecting tools fail.