Title: How to change Firefox locale to ... esperanto?
       Author: Solène
       Date: 14 May 2017
       Tags: firefox
       Description: 
       
       Hello !
       
       Today I felt the need to change the language of my Firefox browser to
       esperanto but I haven't been able to do this, it is not
       straightforward...
       
       First, you need to install your language pack, depending if you use
       the official Mozilla Firefox or Icecat, the rebranded firefox with
       non-free stuff removed
       
       + [link for Mozilla
       Firefox](https://addons.mozilla.org/en-US/firefox/language-tools/)
       + [link for Icecat](ftp://ftp.gnu.org/gnu/gnuzilla/)
       
       Then, open **about:config** in firefox, we will need to change 2
       keys. Firefox needs to know that we don't want to use our user's
       locale as Firefox language and which language we want to set.
       
       + set `intl.locale.matchOS` to `false`
       + set `general.useragent.locale` to the language code you want (eo for
       esperanto)
       + restart firefox/icecat
       
       you're done ! *Bonan tagon*