Thunderbird 3.1.7 upgrade related problem

[Hammer Attila]

Dear List,

This day morning in Lucid security unfortunately original Thunderbird 
version is upgraded with 3.1.7 release.
With Orca 2.30 version this change resulting very slow list navigation 
with mail folders, similar with Maverick original Orca 2.32 version if 
an inbox folder have relative lot of messages.
If a folder have lot of messages, for example the focusing, navigation 
operations is very slow after upgrade.
Another problem: if I choosing an email message, unable to read the 
message body without not try jumping the caret with Tab or Shift+Tab 
key. I not using present messages with new tab option.

See following bug, with partialy fixed the slowest list navigation 
problem under Orca:
https://bugzilla.gnome.org/show_bug.cgi?id=633104

I absolute agree the security upgrades is very important, but this 
change now kill Thunderbird accessibility. Prewious oldest awailable 
Thunderbird version is works fine with Lucid before this upgrade.
I known, Mozilla changed the products supporting model. But if now 
happened this problem, what will be happening for example with Firefox 4 
upgrade?
Before I do upgrade, I forgot hold Thunderbird related packages 
(thunderbird, thunderbird-gnome-support, thunderbird-locale-en, 
thunderbird-locale-hu). What place I possible download this latest 3.0.x 
awailable packages source to undo this upgrade?

Or this is not possible, what will be happening for example the Lucid 
LTS release to we get back Thunderbird accessibility support?

Attila