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Adicione recursos e estilos extras para tornar o Thunderbird só seu.
FecharRealPrevNextButtons for new Thunderbird versions 0.3 Requer reinicialização
por FireballMonkey
Real previous & next buttons for message navigation, updated to support Thunderbird versions through 10.x (and probably future versions). Tested with Thunderbird 9.0-10.0.2 on Ubuntu 11.10, Windows 7, Windows XP, and Mac OSX.
Sobre esta extensão
This add-on is a modified version the RealPrevNextButtons add-on by Shadow912. The hard-coded CSS was replaced with JavaScript to actively clone the style of the regular previous and next buttons on startup, allowing the icons to be correct regardless of the platform and Thunderbird version.