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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.
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.