Add-on compatibility for Firefox 4 – time to get started | BROWSERWIRE.COM. Blog Archive » How we’re breaking some extensions in the near future. You may have read some reports about how we’re re-implementing the bulk of the extension manager in Firefox. It’s been a long running project (something like a year since I first really started planning how to do it). Things are finally started to come together and all being well we are likely to look at landing the first pieces of this on the trunk nightlies in as little as a weeks time. I’ll be up front, this isn’t going to be a perfect landing. There may be some thing that are missing and other bits where the user experience isn’t as perfect as it will be finally. Of course there may also be bugs we have to rush to fix. Despite all this we feel that we’re about at the point where exposing it to the hands of thousands of nightly testers is the best way forward.
One thing I wanted to mention is how this will affect the extensions themselves. Accessing file and version information for extensions The extension manager interface as it used to exist is gone with the new code. UpdateListener - MDC.