Pirata Nervo Wrote:well it depends of a lot of thing including the Hard Drive, if you have your hard drive full of programs and games and whatever, then it will take more time to load each thing because it works like this:
100 mb for firefox. 10 mb here, he other 50 mb there, the other 40 near the 10.
It will take time to load each thing from a different place of your hard drive partitions.
If you do defragmentation, it will help you to make it bit faster, but, a hard drive format would be better.

Not quite.  When you install Firefox, the OS will try to organize things as sequentially as possible.  Defragmenting will remove any of this.  Formatting really doesn't pose any better than defragmenting.
Practically, the HDD seek time shouldn't be the primary issue unless you have tonnes of cached tabs in your session or something similar.