Have you been missing the little green progress from Firefox3.x? So was I, so if you would like it back, here's how.
1. Make sure the Add-on bar is visible at the bottom of the FF8 screen. (View - Toolbars - Add On bar.)
2. Search an add-on (or extension) called Status-4-Evar 2011..... I found it from Q/A in FF Help.
3. Download and install it and let FF8 re-start.
It will look like the screen below, with a bonus green bar in the address window. (Before that I added a little activity wheel - a poor substitute in FF8.)
Am. (m, before progress . m, after progress .)