About Speedyfox:
Firefox uses a SQLite database, and Speedyfox's role is to optimize the removal of SQLite related data files from the Personal configuration folder (and, of course, to clean up other cached files). It also supports the optimization of other software, including Chrome, Skype, Thunderbird and so on. Speedyfox is a green software, its own very small size only 570kb, download without installation can run, currently supports Windows and Mac OS two platforms.
Speedyfox usage: (Take Firefox here for example)
Double-click Run Speedyfox, select Firefox profile, click "optimize!" button. "Command line ..." is about starting Firefox's command-line, and you don't have to ignore it.
Note: Please turn off Firefox before optimizing, and if you cannot find the profile you are using, click "Speedyfox"-"Add custom Profile" on the menu bar to import your configuration folder.