GiPSy was Firefox add-on for downloading tracklog from various devices with direct upload to XContest server.
Due to latter changes of Firefox add-on system, GiPSy development was ended and the software is no longer supported.
GiPSy with Firefox portable
Currently it's not possible to use GiPSy with newer versions of Firefox, but it's possible to use portable version of older Firefox 26 with GiPSy support, prepared by Vitek Fedra.
You can download portable Firefox 26 + GiPSy here. Then you must unzip the archive and run Firefox.exe.