CREATE TABLE table_79301 ("Period" TEXT, "Internet Explorer" TEXT, "Firefox" TEXT, "Chrome" TEXT, "Safari" TEXT, "Opera" TEXT, "Other" TEXT)

What is the other that has 20.80% as the firefox?
SELECT "Other" FROM table_79301 WHERE "Firefox" = '20.80%'
SELECT "Other" FROM "table_79301" WHERE "Firefox" = '20.80%'