I'm not affiliated with meebo. This is a hack script, that may or may not work for you.
Right to left only works from the pop-out window. The inline window, hoever, may display sent message correctly even after the pop-out window is "poped-in".
Mixed Hebrew and English sent to meebo from other chat clients usually works as expected. Messages sent from meebo to some of the other chat clients may not display correctly. MSN Messenger for Windows is an example, although MSN Messenger for Mac OS X works great in both directions.
Some chat clients may display (almost invisible) directional markers before and after each message.

(Downloads till now: 10)

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eBay featured items filter	Date Added: 2007-06-20
This script filters featured items from search listing and forwards automatically if there are only featured items on the current page....

phpBB Recent Topics opener (first unread tabs)	Date Added: 2007-06-20
phpBB Recent Topics opener (first unread tabs)This is a modified version of the phpBB Recent Topics opener by Jaap Kramer. Changes: open in tabs, go to "first unread" posts. 07-03-2007v1.1.2 f...

Neopets - Trophy Counter	Date Added: 2007-06-20
Some people have too many game trophies to count. This script counts them so you don't have to....

YouTube embed download linker	Date Added: 2007-06-20
This script adds download links for YouTube videos embedded in external pages.Most other scripts add download links on the main YouTube page only, this one does so for embedded videos as well. YouT...

Annoying Twat Blocker	Date Added: 2007-06-20
Filters out the annoying twat Emerild from the comments of Violent Acres Talk, making my day that much more enjoyable....

Bigger Slashdot	Date Added: 2007-06-20
Makes text at Slashdot little larger...

Flickr user favorites feed	Date Added: 2007-06-20
Adds a link to a RSS feed for a Flickr user's favoritesFavorites are the best way to discover great photos. If you know a few Flickr users that have great favorites, it is pretty uneasy to check ...

Shartak Suicide Script	Date Added: 2007-06-20
In the web based MMORPG Shartak, you normally cannot attack yourself. This script allows you that....

Flag Profile Button in Member Manage - Orkut	Date Added: 2007-06-20
Adiciona o botao "denunciar" na pagina de gerenciamento de membros, em comunidades....

Rllmuk User Ignore List	Date Added: 2007-06-20
Implements a user ignore list which removes all traces of the users on the list and optionally removes topics created by ignored users and posts which quote ignored users.Implements a user ignore list...

Rllmuk Topic Ignore List	Date Added: 2007-06-21
Implements a topic ignore list, sending selected topics to an unobtrusive Ignored Topics section at the foot of topic listing pages. Topics may also be ignored on search result pages based on the fold...

garnachon	Date Added: 2007-06-21
este es un script de "locutus of borg" que no estaba posteadoQUE HACE ESTE SCRIPT? ** Colores configurables para las cabeceras de los mensajes (ahora tambiÃƒÆ’Ã‚Â©n se colorea * el cont...

Rllmuk out of the frying pan	Date Added: 2007-06-21
Gets rid of giant_frying_pan's signature on rllmuk.That's it....

DotColon remover	Date Added: 2007-06-21
Gets rid of dots and colons that look like this .::: on rllmukThat's it really....

View userscript source links	Date Added: 2007-06-21
Recent Greasemonkey releases do not display the script source in the main Firefox window prior to installation. This script adds a "#" link, for viewing the source, next to userscript links ...