Any extension related to social services like Facebook, Twitter, Tumblr and so on
Addos allowing import/export for any kind of data
Extensions making developer life easier
The addons I immediately install on every new Firefox/Thunderbird profile
Collections make it easy to keep track of favorite add-ons and share your perfectly customized browser with others.
To create your own collections, you must have a Mozilla Add-ons account.
Create an Add-ons Account
or log in to your current account
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