These are a ready make selection of some of the most popular buttons from the Custom Toolbar Button Maker
Thunderbird, Postbox
Restart
Restart the current application after installing a new extension, theme or plug-in.
There is a number of reasons you may want to restart the program your using. Though having installed an extension is the most common. This button take all the hassle and work out of it.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
about:config
Open about:config to change hidden settings that cannot be edited from the Options window.
All Mozilla based programs have settings that can not be changed in the options window. These hidden settings are all reveled in the about:config where anything can be changed or reset.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Passwords
Opens the password manager to view saved passwords
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Free Memory
Free unused memory that Firefox is currently using.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Reset Zoom
Reset Text Size to the default setting.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Work Offline
Toggle Work Offline and Work Online.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Get Extensions
Open addons.mozilla.org on the page to get more Thunderbird extensions. Link can be change using about:config if you prefer another site.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Add-ons
Opens the Add-ons window to perform tasks on your installed Extensions, Themes, Plug-ins and Language packs.
The Add-on's window allows the installation and management of all your extensions and themes. If you need an update, change a setting, swap themes or enable/disable an add-on the Add-ons' window is the place to go. Being able to access this quickly is a necessity for anyone that uses even a handful of add-ons.
The button also contains a drop down menu that allows you to install add-ons, open the add-ons window to the extension or themes tab, or set which websites can install addons.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Print Preview
Open the Print Preview to view a page before printing it.
Paper costs money (and trees) so it is worth checking what the page looks like before you print it. Though it has always amazed me just how much the button gets downloaded.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Zoom In
Enlarge the text size on sites that makes the text so small you can't read it.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey