version 2.4.8 (last for XUL-technology) - is broken: City search does not work
I could not fix and make version 2.4.9, because 2.4.8 uses the outdated version of jQuery
jQuery 1.x is now forbidden by Mozilla, read more: https://bit.ly/1TRIyZY
and I had to choose - either completely rewrite code for WebExtensions (version 3.4) or completely rewrite code for a new jQuery (version 2.4.9)
I chose WebExtensions.
Sorry!