These are the extension IDs of many blocker extensions that you can use if your school disabled the developer mode switch on the chrome://extensions page making it so you cannot see your own extension IDs. This list is universal, meaning it works for any school using the extension besides Lightspeed and Relay. For those who use those they have different IDs for every district, if you use them, go to the extension's chrome://extension page and look at the URL. Everything that is after the chrome://extensions/?id= should be your localized ID.
GoGuardian: haldlgldplgnggkjaafhelgiaglafanh
Securly (new): joflmkccibkooplaeoinecjbmdebglab
Securly (old): iheobagjkfklnlikgihanlhcddjoihkg
Blocksi: pgmjaihnmedpcdkjcgigocogcbffgkbn
iBoss: kmffehbidlalibfeklaefnckpidbodff
Fortiguard: igbgpehnbmhgdgjbhkkpedommgmfbeao
Cisco Umbrella: jcdhmojfecjfmbdpchihbeilohgnbdci
NetRef: khfdeghnhlpdfeenmdofgcbilkngngcp
ContentKeeper: jdogphakondfdmcanpapfahkdomaicfa
Hapara: kbohafcopfpigkjdimdcdgenlhkmhbnc
Smoothwall: jbldkhfglmgeihlcaeliadhipokhocnm
Linewize: ddfbkhpmcdbciejenfcolaaiebnjcbfc
LANSchool: baleiojnjpgeojohhhfbichcodgljmnj