Blck rgn ( Y-blk) s fr nd pn-src brwsr xtnsn fr cntnt fltrng, ncldng d blckng. Th xtnsn s vlbl fr Frfx nd Chrmm-bsd brwsrs (sch s Chrm, dg, Brv, nd pr).
Blck rgn s ctvly dvlpd nd mntnd by ts crtr nd ld dvlpr Rymnd Hll nd th pn src cmmnty. s f Dcmbr 2024, th Chrm vrsn f Blck rgn hd vr 40 mlln ctv srs nd th Frfx vrsn hd vr 9 mlln ctv srs.