CREATE TABLE table_65407 ("Date" CLOB, "Internet Explorer" CLOB, "Chrome" CLOB, "Firefox" CLOB, "Safari" CLOB)

What was the percentage of firefox was chrome was 23.90%
SELECT "Firefox" FROM table_65407 WHERE "Chrome" = '23.90%'
SELECT "Firefox" FROM "table_65407" WHERE "Chrome" = '23.90%'