This coming Thursday we’ll testing all the changes made by a contributor, Alta88 to the RSS component of Thunderbird. Alta88 as been working on RSS in Thunderbird since the beginning of 2012 and most of his changes are now available in Thunderbird Beta. This Thursday may 24th 2012 we’ll be testing the new functionality and the bug fixes.
More detailed instructions are available on the wiki test page at https://wiki.mozilla.org/Thunderbird:QA_TestDay:2012-05-24