Motion Firefox - All-in-one time management tool in Firefox
tabExtend - Easily save tabs and quickly create notes in your browser
Task Muncher - Task Muncher is a cross-platform and web-based application that is designed to organize and keep the track of everything and focus on munching the weekly tasks.
Tabbie - The missing tab manager for Chrome
Taskable - Using multiple work apps leads to tons of context switching, breaking flow and killing productivity.
PepperTab - Notes, Todos, Calendar & Weather on your new tab