Well the other way is to make customizations through the advanced configuration interface by typing "about:config" in the address bar. You will see the interesting warning message. well, just be careful while you are about changing values.
Here you can make a lot of configurations like:
- browser.download.manager.closeWhenDone set it to true to automatically close the download window when the download is complete
- browser.download.dir sets your download directory
- browser.urlbar.maxRichResults sets the number of suggested URLs that appear when you start typing in the address bar
- zoom.maxPercent and zoom.minPercent to alter the maximum and minimum limits of zooming
You can find some configurations explained at ghacks, eriwen's blog and many other locations online. most configurations are self explanatory though.
Using the advanced configuration can be preferable to some people, specially software developers like myself. I already liked it.