Performance/Frontend

Gavin:

• bug 853549 - Remove main-thread I/O from password manager [Q3]
• bug 699854 - Refactor Downloads APIs to use async Storage [Q3]
• bug 699850 - Refactor all synchronous history APIs to use async Storage APIs [some in Q3]
• bug 876002 - [meta] Remove nsIFormHistory2 so no synchronous form history code remains [done]
• bug 843853 - Newtab page slows down tab-open animation [done]

Dolske:

• bug 355063 - Password manager does not work on script-generated forms - Q3

Taras:

• bug 853388 + bug 853389 - JSON+Async addon manager - Early Q3
• bug 838577 - Async session-store - Q3