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British English Dictionary (Marco Pinto) 2.41
This is a forked version of Mark Tyndall's extension. It packages David Bartlett's British Dictionary R1.19 for Firefox, Thunderbird and SeaMonkey.
It has 25'000+ new words and dozens of fixes.
About this Add-on
To enable, right-click in a text box, select "Languages", then "English (United Kingdom)".
(This is a forked version of Mark Tyndall's British English Dictionary extension, improved and made to work with the latest Firefox, Thunderbird and SeaMonkey).
To install add-ons, one can simply search for them from inside Firefox/Thunderbird.
To install manually, right-click on the button "+ Add to Firefox", select "Save Link As" and then install manually the XPI file from: Tools > Add-ons > Extensions/Dictionaries > Install from file.
(see the screenshot above)
Detailed installation instructions:
http://marcoagpinto.cidadevirtual.pt/faq.html (read point 4 for issues)
Nightly changes (GitHub):
I am developing an open-source tool to edit the Dictionary/Thesaurus/Hyphenation/Autocorrect of OpenOffice, LibreOffice, Firefox, Thunderbird and SeaMonkey.
My goal was that in the future someone would use it in Thunderbird and fix the en_GB speller since it was full of typos/missing words and no one offered himself for the task.
A couple of months went by and, since no one volunteered, I took the task myself.
I want to create the ultimate speller, as good or better than the ones used by commercial software. It encompasses several fields of knowledge, from simple to complex words.
To make sure the words I add are the correct ones, I have been looking for them in credible sources such as:
1) Oxford Dictionaries;
2) Collins Dictionary;
3) Macmillan Dictionary;
4) Wiktionary (used with caution);
5) Wikipedia (used with caution);
6) Physical dictionaries.
I am also involved on several projects/hobbies with a specific jargon, which means I can test the words mentioned there. This way I have added some "special" words.
I have been told to use scripts to update the dictionary, but I am adding the words with copy/paste after checking them in the dictionaries mentioned above. This takes longer and is harder but the results are much better and accurate.
On 25.Aug.2013 I released a "forked" V2.00. The speller has been made available to OpenOffice/LibreOffice, Firefox, Thunderbird and SeaMonkey. So far, I have added 25'186 words (as of V2.41).
Just like in other languages, such as mine, there are valid words that can be written differently. Since Oxford says some words are valid both ways, I kept both and let the user decide which he prefers the most. A good example in Portuguese are the words: "loira" and "loura" (blonde) which mean the same and can be written differently.
Main difficulties developing this dictionary:
1) Proper names;
2) Possessive forms;