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* Updated compatibility to support TB 52
* Issue #1: TypeError: card is null
* Refactored to avoid a possible race condition in Thunderbird 45 or later when loading this and other add-ons (notably gContactSync)
Added new locales
Contains the following new locales:
* sv-SE by Mikael Hiort af Ornas
* cs by Michal Stanke
* zh-CN by yfdyh000
* Adds two new Gravatar options: mm (Mystery Man) and retro
* Converts all e-mail addresses to lowercase before hashing for Gravatars
* Supports up to TB 3.3a2pre and SM 2.1b2pre
* Adds vertical alignment option (center or top)
* Adds more Gravatar options
* Adds more border options