Trouble Working with sql.js

please someone should kinda help me... am having challenge with my sql.js library. i have linked it as a script in my html but my browser (firefox) is not rendering it (i mean, not executing the code when i attach them to create my database) saying

Successfully compiled asm.js code (total compilation time 967ms; not stored in cache; 1 functions compiled slowly: Uy:406:116868 (277ms))

"pre-main prep time: 3 ms"

TypeError: window.SQL is not a function

Please, help me. how do i reference it, to worked