Earlier tonight we updated compatibility information for add-ons that work with Firefox 4 to also work with Firefox 5, except in certain cases where we think the add-on may be incompatible. This coincided with the beta release of Firefox 5, though normally it would occur when the Nightly channel is promoted to Aurora, as described in the Rapid Releases Compatibility Plan.
We were able to mark 3,890 add-ons as compatible with Firefox 5. There were 256 that failed our automatic scanners either due to including binary components or using
navigator.language, which was changed in Firefox 5. All affected add-on authors received an email about the compatibility update and instructions depending on whether they passed or failed.
This was our first time doing a mass compatibility bump, so please let us know your feedback on it, especially if you think something didn’t work properly.
One noteworthy issue is that some developers will receive emails saying that a previous version of their add-on has had its compatibility bumped if the latest version is already compatible. We only intended to bump the latest reviewed version of a Firefox 4 compatible add-on, along with any newer versions that haven’t been reviewed yet. This unnecessary change should be corrected for future updates.
Developers will see this process take place again in the next two weeks for the imminent Aurora 6 promotion, and then things will be on their normal track every 6 weeks.