claim: Firefox is an application.
evidence: Gunnr -LRB- alternatively guðr -RRB- is an Old Norse term meaning `` battle '' .. Old Norse. Old Norse. It is the name of a valkyrie in Norse mythology , and was also used as a feminine given name .. valkyrie. valkyrie. Norse mythology. Norse mythology. The modern forms Gun and Gunn remain in use as a feminine given name in Scandinavia .. The word is from Proto-Germanic * gunþiz , which is a common element of Germanic names not only in North but also in West Germanic , as second element especially frequent in feminine names -LRB- as in Hildegund -RRB- , as first element also in masculine names -LRB- as in Gunther -RRB- .. Proto-Germanic. Proto-Germanic. Hildegund. Hildegund ( widow ). Gunther. Gunther. The earliest attestation of the name is on the Rok Stone where it occurs as part of a kenning for wolf  :. Rok Stone. Rok Stone. kenning. kenning. wolf. wolf. Þat sagum tvalfta , hvar hæstʀ se Gunnaʀ etu vettvangi a , kunungaʀ tvaiʀ tigiʀ svað a liggia .. `` I say this the twelfth , where the horse of Gunnr sees fodder on the battlefield , where twenty kings lie . ''