Personally, I think having both the throbber and the progress bar is overkill since both indicate if the page is still actively loading. I prefer just having the progress bar since it also serves as a meter for how far the page is in the loading process.

However, some might find the progress bar a bit small and inconspicuous. So how about making it a bit more prominent like having it the length of the address bar. Heck, how about combining the two? If you’d like that then Fission just might be the add-on for you. It simply combines the functionalities of both in the address. Installing this add-on creates a nice visual effect of showing the page loading progress fill-up in the address bar.

While the function’s pretty much limited to just that, this is more of an interface tweak and benefit those who would find this feature attractive.

Download Fission here.