Force Enable Right Click & Copy & Highlight
< Feedback on Absolute Enable Right Click & Copy
Please note this script made specifically for Google Chrome + Tampermonkey. Not for Microsoft Edge.
A Better workaround for the conflict is to exclude mega.nz. You can do that by open Tampermonkey and near the script name, on the right a menu (three dots) click on it and choose exclude mega.nz.
Conflict with mega.co.nz