Is there a browser that allows you to log in to Facebook in one window (or tab), to Google+ in another, to Twitter in another, etc, such that those windows or tabs have individual/isolated sets of cookies, so that you can browse the web in another window or tab and not have these websites track you?<p>If such a browser does not exist, would it be relatively easy to modify Firefox or Chrome source code to make it behave this way?
There's been an experimental feature in the works under chrome's about:flags page called Multiple Profiles, which may eventually do what you describe, though it's still under development so you aren't able to turn it on yet:<p>Multiple Profiles
Associates every browser window with a profile, and adds a profile switcher in the upper right corner. Every profile has its own bookmarks, extensions, apps, etc.
Fluid (uses WebKit, Mac only) or Prism (based on Firefox) allow you to create standalone apps from websites. Both have separate cookie storage for each website.<p><a href="http://fluidapp.com/" rel="nofollow">http://fluidapp.com/</a>
<a href="http://prism.mozillalabs.com/" rel="nofollow">http://prism.mozillalabs.com/</a>
I use a standard Chrome window + an Incognito Chrome window to do similar, but the problem with that is that if you open more Incognito windows (eg more then 2 sites at once), they share the cookies/etc with the first Incognito window.<p>It'd be nice if every Incognito window had it's own silo'd cookies/data.