Chrome/Chromium - disable HTML5 LocalStorage and Databases for all webpages /or ask user

Question

My question is about fine tuning of Chrome or Chromium browser. It have support of new generation of cookies: HTML5 LocalStorage and Databases. Some ad sites uses LocalStorage to do user tracking, some other sites uses this too. Also, chrome plugins (extensions) often uses localstorage to keep settings.

I want to disable LocalStorage&DB for all sites completely or get it in "ask user" mode. But I want to use extensions which uses LocalStorage and DB.

Is it possible?

Answer 1

While some resources on the Internet claims that Chrome's cookie blocking does not also block LocalStorage, I just ran a quick test and discovered that it does actually block LocalStorage, (at least in Chrome 12, the current beta version).

Just click the Wrench and choose Options (or Preferences on UNIX-like platforms), go to the Under the Hood tab, select Content Settings, and choose the Block any sites from setting data option:

While you're there, you can select Manage Exceptions to whitelist certain sites, or All Cookies and Site Data to manage or delete existing data.

Now when you visit a site, a small icon will appear indicating cookies or LocalStorage has been blocked:

If you click on that, choose Show cookies and other site data, and select the Blocked tab, you can see what data the site tried to save and whitelist sites on a temporary or permanent basis.