The opt-in feature, which can be enabled from the browser's preference dialog, will help Mozilla further improve Firefox performance.

The feature consists of a simple HTTP header flag that can be toggled through the browser's preference dialog.

Another noticeable change is that the checkbox for toggling the Do Not Track (DNT) header has been moved to the Privacy tab of the browser's preference dialog.

The Bindwood Firefox add-on also lacks a preference dialog, so there is no way to instruct it to use a specific CouchDB server.

Like the preference dialog, I'll leave that as an exercise for the reader.

A number of internal configuration options are not accessible in a conventional manner through Firefox's preference dialogs, although they are exposed through its about:config interface.

After you install the add-on and restart your browser, Firefox's preference dialog will appear and prompt you to configure your Weave account.

The individual Personas will show up on the theme list in the browser's preference dialog you.

Mozilla has added support for this feature in Firefox 4 and has made it accessible through a checkbox in the browser's preference dialog.

New icons have appeared in both the default Windows and Linux themes and are particularly noticeable in the preference dialogs and in the application menus.