

Checking the network traffic, it does a series of “s_a_f_e…Overflow” (indicating safe buffer overflows?), replacing them with filter-list-specific domains after the overflow (the address after the long string of characters); triggering uBlock to block these requests?

Hmm, maybe it also monitors for changes to the DOM: cosmetic filtering done by uBlock (to hide/remove containers for these elements)? Something which network filtering by itself cannot do?