On your computer, open Chrome.
At the top right click on the Grey Puzzle piece and then Manage extensions
Remove any non-school extensions (themes, games, emulators, VPNs, Ad Blockers, etc.)
Turn off all other extensions (Note: If the extension cannot be turned off, it is being managed by the KPDSB)
Sign out of the Chromebook
Sign into your account again
Turn on extensions one at a time to identify the problem extension
More information | Chrome Webstore Help
Click on the Grey Puzzle piece and then Manage Extensions
On this extension tile page you can REMOVE or toggle the Extension On/Off