I've never relied on java speed tests and launch times to gauge my browsers. I've always been firm in using the real world notion of speed. Does browser XYZ allow me to do every day things faster than the other browsers I have installed? That's the question I ask and when put to the test I find that Firefox wins every single time.
This is why I've also always bumped Firefox for its extension power and customisation because once people understand how much power there is, they will save themselves bursts of time which when added up make a bigger chunk of time saved.
Just like overtaking a car doing 70 in front, the more cars you overtake in bursts the more ground you cover and the more time that is saved up over the whole journey as a whole.
Example:
Uploading an image I find on a website to my own web hosting space then linking it on a forum. On any other browser this process could take more than 30 seconds as you download the image, open the ftp client, upload it, browse to the directory in the browser, copy the URL then paste it into a forum reply and wrap it in image tags.
On Firefox I right click the image on the website directly thanks to
rehost image, select my hosted directory and it uploads and copies the http URL into the Windows clipboard. All I then have to do is right click on a forum reply and select
BBCode > Image > Paste from clipboard and there it is, wrapped in image tags. Takes seconds in total.
Or if it's a local file then just use
FireFTP which also copies http URL to clipboard.
^ That's just one example of a few extensions that save me a whole load of time daily. There are many more and other people have lots of other neat ways to do things thanks to Firefox.