Gemius is a web statistics company which provides its services to many sites in Poland, including all the major web portals like Onet or Gazeta. Aggregated whole-Poland statistics from Gemius are presented at www.ranking.pl. Gemius has also recently opened its subsidiares in the Czech Republic, Lithuania and Ukraine.
I think it might be interesting to compare the market share of Firefox and Gecko in these four countries:
Yes, I am as happy as Gandalf is, that every fifth Internaut in Poland uses a Gecko-based browser. I still remember the days when Gecko had a market share of 2% or lower. So, it's a great success and I'd like to repeat Gandalf's congratulations to the whole Polish Mozilla community. I'm also pretty sure that 20% is not our final word. ;-)
It's clearly visible that Firefox has greater market share in countries, where official localizations are available. So, every effort should be made to help non-official localizations to "officialize" themselves, and avoid situations like bug 281662 (Lithuanian official localization of Firefox 1.5 is blocked since February due to no apparent reason).