CREATE TABLE table_65885 ("Source" CLOB, "Chrome" CLOB, "Internet Explorer" CLOB, "Firefox" CLOB, "Safari" CLOB, "Opera" CLOB, "Other" CLOB)

What percentage of users were using Firefox according to the source that reported 15.40% used Safari?
SELECT "Firefox" FROM table_65885 WHERE "Safari" = '15.40%'
SELECT "Firefox" FROM "table_65885" WHERE "Safari" = '15.40%'