I wanted to inject some codes on Github, however I received Content Security Policy errors. It’s because Github blocks this kind of injected code.
To bypass this restriction I installed the addon Content Security Policy Override (if you have Firefox you can install this Chrome addon using Chrome Store Foxified) then I applied the below rule in the addon’s settings :
[
["https://github\\.com/*", [
["script-src", "script-src 'self' 'unsafe-inline' 'unsafe-eval'"]
]]
]
Now my Violentmonkey script works.