The error "This web page was blocked by an extension" occurs when trying to access Gmail from a Chromebook.
This issue is typically caused by an out of date revision of Chrome OS. Please update the Chrome OS.
https://support.google.com/chromebook/answer/177889?hl=en
If you Powerwash and Reset your Chromebook, one of the first things that it does is update the Chrome OS for the latest release.
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