Hi, good extension, but please change:
open new 'map' tab after current tab !
(not last tab)

Works

It would be nice if an Accelerator key would be mapped to the menu item.
It would also be nice if the developer left a way to contact him/her.

Works like expected!

Just what I was looking for, select an address or just a location, right click and in the context menu look for "Open on Google Maps". Perfect! Edit: More perfect, wish I could give it extra stars... can select lat,long coordinates and hit the"Open on Google Maps" menu option and "PLOP" opens to the coordinates, not just addresses or places! Wish I'd had this years ago!!!!!!!

It does EXACTLY what it promises to do, every time. That, to me, makes it a reliable and dependable addon. Good job!

map and sidebar appear as expected

On Google, the sidebar remains empty. So I can not use any maps feature.