Following the instructions from here: http://www.mozilla.com/thunderbird/dictionaries.html I drag the relevant link (English UK), from Firefox to Thunderbird's extensions window, the extension install popup appears.. after the timeout, click install and it proceeds to download and install, followed by the entry disappearing from the extensions list as expected. However the dictionary never shows up in Edit->Preferences->Composition->Spelling->Language This seems to be an ongoing problem (see bug 74287 and bug 96189 ), but no one has come up with an answer. Does everyone have this problem or only some people?
*** This bug has been marked as a duplicate of 125931 ***
