That status bar was removed in Firefox 4.0. While some of the status bar items did find new homes, some did not, and you might not like where they ended up. There were also some nice innovations during the development of Firefox 4.0, such as progress/links/status in the location bar, which unfortunately didn't make it to the final release.

Status-4-Evar aims to bring back (some of) the old status bar items, give you more control over the built-in Firefox features, and provide new alternatives.

The extension provides "Status Text", "Progress Meter", and "Download Status" items. These toolbar items can be moved wherever you want by customizing the toolbars. Behavior of the toolbar items, and other additional settings, can be controlled in the extension preferences.

This extension can also act as a replacement for the Fission extension. There are preferences to show links, status, and progress in the location bar instead of the toolbar items.

Get the extension at AMO

User support topic

When Firefox downloads a file, it sets the file modification time to be the current time. This is pretty much how every browser behaves. However, some will point out that this behavior is actually wrong (though it's a matter of opinion).

This extension allows Firefox to preserve the modification time, that is sent by the server, when you download a file. This should work for any file downloaded via http://, file://, or ftp:// (Firefox 4.0+ and SeaMonkey 2.1+) so long as the server sends the proper information.

Get the extension at AMO

User support topic