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Please ignore the issue. It seems it was a user error and easily fixable with https://violentmonkey.github.io/2018/11/23/inject-into-context/
In case anyone wants to fix this (and other CSP errors) in firefox, set
Default Injection modeto `Auto.It could be just me, but this script seems to be working ok with GreaseMonkey, but not with ViolentMonkey.
Would you be interested in making it work with the latter? (why violent you may ask? because i find it easier to sync all the userscripts on all my machines, that's all)
Thanks!