Add a new language to Thunderbird spell check

Question

I would like to add Persian language to the Mozilla Thunderbird spell check. The available dictionaries page does not contain my favorite language, however it is available in firefox and Open Office dictionaries. The only relevant result I found here does not describe how to add a dictionary to Thunderbird dictionaries page.

Could anybody tell me how I can contribute a new dictionary to Mozilla Thunderbird dictionaries as they appear in above mentioned page?

Answer 1

First you should "save as" on the Firefox dictionary addon you found, and then try to add it in Thunderbird as is. ("Install addon from file"). The Firefox addon probably also contains the relevant section that will make it usable for Thunderbird.

If it doesn't work, check this page on MDN. The page also applies to Thunderbird dictionaries.

Especially, if you got a message along the lines of "this addon is not compatible with your version of Thunderbird", you can just unzip the .xpi, modify the "install.rdf" file and put an updated value in maxVersion. Zip back the content of the folder, rename to .xpi and try to install again.