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|User since||June 24, 2011|
|Number of add-ons developed||0 add-ons|
|Average rating of developer's add-ons||Not yet rated|
This is something I searched for a long time!
However, the default symbols "<<<" and "<" for "mails just for me" and "list mails" should be exactly the other way round: more "<" signs for more recipients.
I found out that Shadow912's version can be used without change in Firefox 6 (and probably also in future versions) by using Mozilla's "Add-on Compatibility Reporter": https://addons.mozilla.org/en-US/firefox/addon/add-on-compatibility-reporter/ .This user has a previous review of this add-on.
I have enabled Shadow912's version for Firefox 5.0.*, you can get it here: