That looks like an MBAM application block. The extension block looks different
(see picture of heuristics block = known malware spread from a new location)
View attachment 297339
Simular to AlphaMountain AI (of Osprey) this heuristics detection of MalwareBytes browser Guard usually beats Symantec Browser Protection in "block at first sight".
With this type of malware links it (existing payload spread from new location) nr1 is usually MalwareBytes Browser Guard (heuristics), nr2 Symantec, nr3 Avira, nr4 Bitdefender (I never tested Norton because I thought Norton Safe browsing was abandoned, but it did not chew URLHause links well, when I tried yesterday).
With this type of malware, AI and heuristics really do well. Curious to see how
@Trident extension does (I can' t test it on Linux)