Best add-ons or extensions for Gmail

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Gmail is already great, but those Firefox plugins or Chrome extensions makes it even more great.

Suggestions

Boomerang

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Makes it possible to schedule emails. And (very useful for sales) let you remind you if you donâ€™t hear back

WiseStamp

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Gmail's signature is very limited. WiseStamp boosts your signature.

Mixmax

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Total Solution to improving the Gmail Experience. With constant improvements.

ActiveInbox

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Turn your inbox in a massive 'To do'-tool. It'll turn your messages into tasks, tracking and prioritizing, even turning groups of tasks into projects.

Sidekick

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Tracks who opens your emails, when how often and from where.

GMass

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GMass turns your regular Gmail account into a full email automation app with open / click rate tracking & mail merge.

Yanado

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Yanado is a Task and Project management tool in the form of a Gmail Skin/Overlay.

Streak turns Gmail into a lightweight CRM. Send templated emails, track responses, and more. The "send it later" function on the emails is great if you happen to be working on emails to prospects in the middle of the night. Not that you would be doing that.

FullContact

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FullContact: Contact Management Software & API, keeps all your contacts in one place and automatically up-to-date with the FullContact Address Book.

I've started using this and have been immediately impressed and grateful for the core GMAIL UI improvements and functionality it offers. I can now acccess my contact within GMAIL without navigating out and away. There's more but I'm just getting started.

SORTD

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Sortd Smart Skin for Gmail: Transform your email interface into organized lists and discover a whole new way of working with email.

Sigstr

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Super powerful signature management tool with A/B testing and analytics.

Do you miss any tool on this list?