Whenever I am typing anything in my firefox, every word is underlined red (firefox cannot find it in its dictionary).
How to add the default dictionary to firefox?
[using Firefox 3.5.2 on Red Hat]
got it! -> I was using the malay dictionary.
Right click inside a text field; in the "languages" submenu you can set the current dictionary and download new dictionaries.
go to https://addons.mozilla.org/en-US/firefox/browse/type:3 , select the language and then it should ask you, if you want to install the dictionary and if you want it as standard