Hello, I'm Dark Reader developer.
Just opened Opera today and the extension worked on Google Search page. It stopped working on Google Search after the Opera update.
p.s.: Something is wrong with percent calculations during the update 
Best posts made by alexanderby
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Opera add-onsRE: Dark Reader extension doesn't work on google.com with Opera
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Opera add-onsRE: What is means about "Please verify your email" when accessing add-ons developer page
Doesn't work for me too.