I am a teacher in Spain and in my educational center we work with mBlock5 online because we use linux (debian).
I bought 45 oled screens this academic year (due to COVID my students cannot share materials).
I have developed an extension for OLED screens and it works well offline. In this post it is documented:
In my school we do not have windows or iOS and, for this reason, I need this extension to be able to be used with mBlock5 online.
Can you help me?