Need a more efficient intermediate security option for wiping mode for browser files...

For those who just want to make sure passwords and financials aren't compromised but don't visit nasty sites or sites with images that are considered "offensive" or which would contain personal / financial data, how about a mode that securely wipes all files *except* image files and thumbnail images so that the wiping of personal data and page information (save images) is the only part wiped so that there is a faster mode of secure wiping available?

I'm confused....

Why would you want to securely wipe all personal files except images?