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Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
I use acrobat reader program to view pdf, i need disable Chromium PDF Viewer plugin, but checkbox is readonly.
In Settings, check 'Open PDF files in the default PDF viewer application'.
Or check your user permissions.
:doh: Ouch, You checked Opera://Plugins :rolleyes: