Extension Manager buttons: Firefox

Adds toolbar buttons for the extension manager and theme manager, just drag them from the toolbar's customize window.
The buttons have a context menu which allows you to open either manager or the EMbuttons options window.
The options window allows you to choose to open each manager in a window, a tab, or the sidebar.
You can also choose to sort the lists alphabetically.
There is a Concise Mode for the extension manager, which shows only extension names and versions in the extension manager window, allowing more extensions to be seen simultaneously. All functions are still available via the context menu.
Performance Mode complements Concise Mode by removing unnecessary graphics and effects from the extension view, which helps with the performance problems Firefox can cause when the extension manager window is open.
Keyboard shortcuts: Control+Shift+E - Extension Manager, Control+Shift+T - Theme Manager, Control+Shift+O - Options.
The Tools menu items will honour the settings for EMbuttons, and also show the keyboard shortcuts.
EMbuttons supports the extension manager's update feature.

New in 1.1.0: EMbuttons integrates with POTO Sidebar 0.2 (Extension Manager only). To make the button on POTO Sidebar's toolbar work as expected you should ensure that you have the Extension Manager set to open in the sidebar.
Note: POTO Sidebar 0.2 only works with English locales.

Locales Included
English (en-US).
Italian (it-IT), maintained by Giuliano Masseroni (jooliaan), site admin of eXtenZilla.it and Mozilla Italia.
French (fr-FR), maintained by Xavier Robin.
Spanish (es-ES), maintained by KariuS of NAVE (since 1.0.2).
German (de-DE), maintained by ReinekeFux (since 1.0.2).

Extension Manager buttons: Thunderbird

Adds toolbar buttons for the extension manager and theme manager, just drag them from the toolbar's customize window.
There is a Concise Mode for the extension manager, which shows only extension names and versions in the extension manager window, allowing more extensions to be seen simultaneously. All functions are still available via the context menu.
Performance Mode complements Concise Mode by removing unnecessary graphics and effects from the extension view, which helps with performance problems when the extension manager window is open.
You can also choose to sort the lists alphabetically.
The Tools menu items will honour the settings for EMbuttons.
EMbuttons supports the extension manager's update feature (since 0.3.2).

Since 0.3.3 EMbuttons includes Italian (it-IT) localization, maintained by Giuliano Masseroni (jooliaan), site admin of eXtenZilla.it and Mozilla Italia.

Easy Get Mail Button

This extension adds get all messages capability to Thunderbird's standard Get new messages button, by making it context-sensitive:
If you have the root folder of an account selected in the folder pane it will get the new messages for that account only.
If any other folder is selected (including a subfolder of an account), it gets new messages for all accounts.
Easy Get Mail Button supports the extension manager's update feature (since 0.2.1).