Make you measurement easy with Chrullex (CH-rome RUL-er EX-tension)
Thanks to Lorenz, I understood I have to restart Chrome to get this tool working, otherwise I would have commented, like lot of others, that it doesn't work. Once restarted, Alt+Q starts it (or click on the icon if you let it displayed), you can draw a rectangle, then more and resize it, and even rotate it with angle display. Ctrl+I displays distances from window borders. You can draw several rectangles with Ctrl+drag. A good tool, just lacking a bit of mopre instructions.
punxnot
Trishul
https://www.felixniklas.com
https://designer.tools
leocompson
tgohn
Unknown
Online Apps
https://measuremate.xyz
Alex
Matthias Schuetz
https://welldonecode.com