Localization issue:

 Now the following countries are supported:
	 Brazil, Colombia, Hungary, Mexico, Poland, Serbia, Spain and Venezuela
 Here was the reason I decided to support these countries
"In February 2013, Mozilla announced plans for global commercial roll-out of Firefox OS.[26] Mozilla announced at a press conference before the start of Mobile World Congress in Barcelona that the first wave of Firefox OS devices will be available to consumers in Brazil, Colombia, Hungary, Mexico, Montenegro, Poland, Serbia, Spain and Venezuela"
Wikipedia
(Google news doesn't have  the Montenegrin local version)