I am currently working on a major change for the object tabs feature and noticed that supporting four Firefox versions (3.0, 3.5, 3.6, 3.7) is way too much. From what I understand, Firefox 3.0.18 is still going to be released mid-February but that's the last Firefox 3.0 release - users are encouraged to migrate to newer Firefox versions (preferably 3.6 of course). This means that supporting Firefox 3.0 is no longer a priority for Adblock Plus.
What this means in detail:
- Changes to Adblock Plus might result in limited functionality in Firefox 3.0 if keeping Firefox 3.0 in sync requires significant effort. For example, in Adblock Plus 1.2 on Firefox 3.0 the position of object tabs will most likely not adapt if you scroll the page or otherwise move the object the tab is attached to.
- Testing with Firefox 3.0 will not be as thorough as it is with newer Firefox versions. This is unavoidable given that most users of Adblock Plus development builds no longer use Firefox 3.0.
- At some point changes in Adblock Plus might cause a major break of functionality in Firefox 3.0. If that happens and avoiding the breakage requires significant effort support for Firefox 3.0 will be dropped altogether.
A special case is Songbird - it is currently based on the same code as Firefox 3.0 and the above affects it as well. Unfortunately, there is no Songbird version available that would use newer code. Only the release following Songbird 1.7 should catch up with Firefox 3.6 (this isn't even certain however). This is very unfortunate and it might happen that Songbird won't be supported at all for a short time.