Version 1.6 should be released once it has been approved. It was submitted early April and should thus hopefully appear soon… You will then be able to get it from the add-on store here. Right now this still offers 1.4
It is still not approved?
Yeah, not, I see. Sorry
@oparoz you know of anything?
The Mozilla approval process is under resourced. Version 1.5 reached position 18 in a queue which can be as high as 500. It was submitted on the 5th of April.