This line appears to be detected as a threat:
user_pref("extensions.Imagus.hz", "{\"deactivate\":1,\"actTrigger\":\"ctrl\",\"delay\":300,\"delayOnIdle\":true,\"zoomresized\":25,\"markOnHover\":\"dashed\",\"preload\":0,\"placement\":0,\"fullspace\":true,\"hiRes\":true,\"hiResOnFZ\":3,\"thumbAsBG\":false,\"thumbAsBGColor\":\"#c3c3c3\",\"thumbAsBGOpacity\":0.3,\"hideIdleCursor\":500,\"history\":t...