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Debug Mobile Browser via Desktop Browser

  • Hi,
    recently I tried to debug a website following the following guide for chromium based browsers

    I'm on a Galaxy S6, Android 5.1.1.
    I have already set up USB debugging for other applications, so Drivers and USB Debugging are active.

    But when I type "opera:debug", I get "This Webpage is not available".
    I tried it with latest "Opera Mobile 37.0.2192" and "Opera Mobile for Developers 41.0.2246".
    Also tapping 'Installation-ID' seven times within Operas settings to enable developer mode didn't help.

    Can anyone prove it is working?
    Is there anything missing from the Guide referenced above?