Just updated to 56.0.3051.99 and started having this same "aliexpress ad bar".... (haven't updated for months, not sure wich version i came from).
This shows up eventually on new pages (including the extensions page)...
This is really annoying and definetly a no-go for me. if its a new thing, i would like to revert to a previous version... is that possible ?
BTW, only extension enabled is LastPass.