This is Adblock Plus 1.1.1 but marked compatible with Songbird 1.4.
This is mostly a bugfix release that fixes several issues in Adblock Plus 1.1.
This development build is pretty close to Adblock Plus 1.1 release, it is compatible with Songbird 1.2b1. For more details, see full changelog.
* New translation: Serbian
* Element hiding works in Firefox 3.0.9 and higher again
* Regular expressions with $domain options are recognized correctly
* Blockable items: when copying addresses or filters to clipboard platform’s linebreaks are used as separator (previously: Unix linebreaks)
* Preferences: using more compact date formatting for last hit column and last download of subscription
* New translations: Icelandic, Kazakh
* Disabled filters are now displayed in list of blockable items and can be reenabled with one click
* Filters can be restricted to a domain with $domain=foo.com option
* Improved start-up performance
Detailed changelog: http://adblockplus.org/en/changelog-1.0.1