The default bug view has changed. See this FAQ.

Add-on SDK
The software development kit for building Firefox add-ons. More info at: Jetpack project documentation.
Select a component to see open bugs in that component:
Issues with the SDK's built-in documentation, including inaccurate or misleading statements, missing or insufficient descriptions, structural problems, grammatical errors, typos, and formatting flaws.
Miscellaneous bugs in the Add-on SDK. More info: Jetpack wiki pages.