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Google Chrome warns uBlock Origin may soon be disabled
(www.bleepingcomputer.com)
This is a most excellent place for technology news and articles.
I'm pretty sure you can install Firefox on those too can't you?
Looks like you can, but if you have an older Chromebook (which most schools definitely have), it takes more work than I think a lot of people would be willing to do.
https://www.mozilla.org/en-US/firefox/browsers/chromebook/
Also, at least in the case of my daughter's school Chromebook, the Play Store was disabled.