After the "2018 update" breaks other sites.
For instance, renders GitHub unusable (cannot fetch recent commits, "Create commit" button is never enabled), breaks mouse wheel zooming functionality on certain map viewers.
It took me a while to figure out this very addon is after all of it, because it didn't make any sense. However, disabling it alone fixes everything I've described.
DO NOT USE the current version (at the time of my writing), unless you want random sites appear broken for no reason.