There are four listeners with blocking ability on the webRequest API.
The design document says "potentially removing blocking options from most events". There is one mention that the blocking ability of webRequest.onAuthRequired may still be required.
From this I deduce that the plan is to remove the blocking ability of the three remaining listeners with blocking ability
uBlock Origin uses two of these remaining blocking listeners, uMatrix uses three of them.
The design document says "potentially removing blocking options from most events". There is one mention that the blocking ability of webRequest.onAuthRequired may still be required.
From this I deduce that the plan is to remove the blocking ability of the three remaining listeners with blocking ability
uBlock Origin uses two of these remaining blocking listeners, uMatrix uses three of them.