This is a wishlist of features for Firefox n/Mozilla 2:

Core Capabilities

• Extension dependency (warn or retrieve at install time, hierarchical)
• Security sandbox for capabilities (when you add - java security model)
• Out of process plugins
• No browser restart required (for addons, themes, plugins). Dynamic loading and unloading
• Quick theme preview/switching (no restart required)
• Runtime characteristics - mem usage, performance impact?

Firefox capabilities

• Finish UI work for extension dependencies
• Install for all users versus current user
• Context-specific add-ons discoverability
• Native support for add-on locale packs - bug 285848
• Complete work on conflict resolution - bug 382312

Website Integration/AMO

• Retrieve GUIDs that you have installed
• This site wants to get a list of your addons
• Check if GUID is installed with a whitelist
• Addon sync service (addons backup/restore to/from website). {Can be more general Fx profile sync service}
• Maintain a list of conflicting add-ons and warn on install

Update Channels

• Ability separate release level and sandbox (separate update vector for extensions) [no update available for sandbox'ed items]. Similar to nightly testing channel (custom AUS channel for sandbox or other)
• Subscribe to different AMO channels (like clearance levels) - perhaps that's too much