OneTab - Whenever you find yourself with too many tabs, click the OneTab icon to convert all of your tabs into a list. When you need to access the tabs again, you can either restore them individually or all at once.

Jungle Scout - Amazon product research made easy.

Workona - A better way to work in the browser.

Inventory Spy - Spy how many products remain on any Amazon Product’s offer listing page.

Session Buddy - Manage Your Browser Sessions

AMZScout - AMZScout extension will help you make a decision about picking a niche based on the actual data, not intuition.