Thanks. Great to read you work on anti-fingerprinting, I'd name this among the most important subjects today.

I don't code privacy enhancing extensions myself (that feels like "inventing my own crypto" for me - not enough competence to be sure I won't make it worse actually), I've just noticed Firefox becomes significantly more slow when I enable them so I guess there probably are some sorts of bottlenecks in the Web Extension APIs (or maybe not really).