Sorry for cross-posting -
In order to help add-on authors, the evangelism team is working on
documenting changes between Firefox 3.0 and Firefox 3.1 which could
affect extensions.
To make our task easier, we ask that you please add "late-compat" and
"dev-doc-needed" keywords in (owner or reviewer) bug reports which
could break extensions compatibility or provide new extension
features.
late-compat : Used to indicate bugs which may affect compatibility of
extensions or external code developed earlier in a cycle.
dev-doc-needed : Developer documentation is required for the changes
in this bug.
It would help us tremendously in identifying migrations issues.
Thanks !