[youtube.com] Arrow buttons constant binding

v0.0.1.4

15-01-2020

made optional debug-mode logging; added «@run-at document-end» meta in hope it fixes eventual not-working of the script

v0.0.1.3

20-12-2019

Was stunned to discover getElementsByClassName can be 1k times faster than querySelector

v0.0.1.2

20-12-2019

The descriptions & the script name & namespace correction

v0.0.1.1

19-12-2019

just a formatting & description correction

v0.0.1

19-12-2019