Rated 4 out of 5 stars

le Douglas Held ar Aib. 14, 2009 · buan-nasc

As far as I'm aware Firefox does not provide any way to change locale after downloading the installer, so this add-on is great.

I didn't find it playing well with my combination of master password, master password timeout, and tabs, however. Your mileage may vary.

This plugin restarts firefox any time you change the locale.