Forcing browser to use additional Storage on Computer

Hi

I'm using IndexedDB and localStorage for my web application.

I experienced that I could not download files from my web application because at one point I did not allow to use additional storage on computer.

After researching for resolution, I found out about the additional storage setting and followed instruction (http://www.msoutlook.info/question/864) to delete the setting then allowed to use computer storage.

I was wondering if there is a way to force browser to allow to use computer storage?

I tried to add into trusted site list but it seems not working either.

Thanks in Advance!