Comment 17 for bug 288236

I don't know in which ways the site specific prefences are used, but in the current implementation there's no need to be able to get a list of all sites that have a specific zoom level set – as far as I can tell. The only thing that's needed, is being to check whether a preference has been set when a user visits a site.

Wouldn't it therefore be possible to store, for example, the MD5-hash of the website instead of the address? If the user visits a website, the browser will lookup the hash in the sqlite table and if it's in there, use the preferences. This way it'll be quite hard to find out which sites a user has actually stored preferences for, apart from trying them all.

Nonetheless, it would still be useful (I think) to be able to clear these preferences in preferences, although it would be less of a privacy hazard if not cleared.