Wow! I can't believe firefox has such a good auto-complete addons Rated 5 out of 5 stars
I just learn "clippings", while I search ff addons about adding multiple keywords (alias) for search engines.
It's useful for my firefox on ubuntu. However, my another dual-boot sys. Windows 8, has similar system-wide auto-complete application , called "PhraseExpress", i.e. Clippings will be installed on my linux system at this time.