Even though we're an English forum... some of us might need one of these :).

https://addons.mozilla.org/en-US/firefox/addon/3077 [German]
https://addons.mozilla.org/en-US/firefox/addon/3643 [Iceland]
https://addons.mozilla.org/en-US/firefox/addon/5485 [Albanian]
https://addons.mozilla.org/en-US/firefox/addon/3627 [Croatian]
https://addons.mozilla.org/en-US/firefox/addon/3716 [Lithuanian]
https://addons.mozilla.org/en-US/firefox/addon/7583 [Persian]
https://addons.mozilla.org/en-US/firefox/addon/4663 [Slovakian]
https://addons.mozilla.org/en-US/firefox/addon/5127 [African]
https://addons.mozilla.org/en-US/firefox/addon/7479 [Vietnamese]
https://addons.mozilla.org/en-US/firefox/addon/5563 [Latin]
https://addons.mozilla.org/en-US/firefox/addon/3646 [Hebrew]
https://addons.mozilla.org/en-US/firefox/addon/4964 [Romanian]
https://addons.mozilla.org/en-US/firefox/addon/4782 [Ukrainian]
https://addons.mozilla.org/en-US/firefox/addon/3049 [Swiss German]
https://addons.mozilla.org/en-US/firefox/addon/3623 [Bulgarian]
https://addons.mozilla.org/en-US/firefox/addon/3439 [Greek]
https://addons.mozilla.org/en-US/firefox/addon/3064 [Svensk]
https://addons.mozilla.org/en-US/firefox/addon/3369 [Catalan]
https://addons.mozilla.org/en-US/firefox/addon/3386 [Hungarian]
https://addons.mozilla.org/en-US/firefox/addon/3677 [Arabic]
https://addons.mozilla.org/en-US/firefox/addon/3596 [Danish]
https://addons.mozilla.org/en-US/firefox/addon/3155 [European Portuguese]
https://addons.mozilla.org/en-US/firefox/addon/3291 [Dutch/Netherlands]
https://addons.mozilla.org/en-US/firefox/addon/3052 [Polish]
https://addons.mozilla.org/en-US/firefox/addon/3703 [Russian]
https://addons.mozilla.org/en-US/firefox/addon/3053 [Italian]
https://addons.mozilla.org/en-US/firefox/addon/3554 [Spanish]