Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_45 (netscape VARCHAR, firefox VARCHAR)

### Question ###
What percentage of users were using Netscape during the period in which 21.67% were using Firefox?

### Accurate SQL ###

SELECT netscape FROM table_name_45 WHERE firefox = "21.67%"