Masking Opera to play IE is not a fully functional solution for HTMLArea. You can easily change a couple of lines in lib files of moodle and HTMLArea to make HTMLArea partly working with Opera (latest versions) - read http://moodle.org/mod/forum/discuss.php?d=35939 - but Moodle 2.0 will have a totally different editor anyway, TinyMCE, that supports all modern browsers.
Text editors
Opera verion 9.64
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