And now with the right settings you can make it still more faster, more than doubling your speed in some situations, with just a little bit of your time. Just follow the steps, it just takes 5 minutes not much.:

1. Enable the pipelining
Pipelining is a technique that lets the browsers send multiple requests before any responses are recieved and it often reduces the page downloading time. To enable it yoou just have to type about:config in your address bar, double-click network.http.pipelining and network.http.proxy.pipelining so their values are set to true, then double-click network.http.pipelining.maxrequests and set this to 8. But some servers don't support pipelining, though, and if you regularly visit a lot of these then the tweak can actually reduce performance. Set network.http.pipelining and network.http.proxy.pipelining to false again if you have any problems.

2. Render quickly

Heavy pages takes a while to download and firefox doesn't want to keep you waiting so it displays what it's recevied so far every 0.12 seconds (the "content notify interval"). While this helps the browser feel snappy, frequent redraws increase the total page load time, so a longer content notify interval will improve performance.
Type about:config and press enter, then right-click somewhere in the window and select New > Integer. Type content.notify.interval as your preference name, click OK, enter 500000 and click OK again.
Right-click again in the window and select New > Boolean. Then create a value called content.notify.ontimer and set it to True and finish the job.

3. Faster loading

If the Firefox user doesn't move their mouse or touch the keyboard for 0.75 seconds then Firefox enters a low frequency interrupt mode, which means its interface becomes less responsive but your page loads more quickly. Reducing the content switch threshold can improve performance, then, and it only takes a moment.
Type about:config and press Enter, right-click in the window and select New > Integer. Type content.switch.threshold, click OK, enter 250000 and click OK to finish.

4. No interruptions

You can take the last step even further by telling Firefox to ignore user interface events altogether until the current page has been downloaded. This is a little drastic as Firefox could remain unresponsive for quite some time, but try this and im quite it will work for you.
Type about:config, press Enter, right-click in the window and select New > Boolean. Type content.interrupt.parsing, click OK, set the value to False and click OK.

5. Block Flash

Intrusive Flash animations are everywhere, popping up over the content you actually want to read and really slows down your browsing. Fortunately there's a very easy solution. Install the Flashblock extension (download it from http://www.flashblock.mozdev.org) and it'll block all Flash applets from loading, so web pages will display much more quickly. And if you discover some Flash content that isn't entirely useless, just click its placeholder to download and view the applet as normal....

So now you'll have a faster browser with less interrupts and smooth display...enjoy..!