Quick Highlights од Lukáš Fíl

HOW IT WORKS
Select any text, tap H, done. Hold H to choose from 4 colours and release to apply the chosen colour. To remove a highlight, click on it or press R. When you're ready, press C to copy everything to your clipboard in reading order, one highlight per line.

SHORTCUTS
H –> Press H for yellow highlight
H –> Hold H to choose from yellow, green, red, or blue
R –> Remove last highlight (OR double-click on a highlight)
C –> Copy all highlights to clipboard

PERMISSIONS
Quick Highlights listens to keyboard events, reads and modifies the text of pages you visit in order to display highlights, and requires clipboard access to copy your highlights. It runs entirely on your local machine and stores nothing.