These are a ready make selection of some of the most popular buttons from the Custom Toolbar Button Maker
Thunderbird, Postbox
about:about
Lists all the "about" pages so that they can be opened.
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
Empty Trash
Empty the Trash Folder
Compatibility:
Thunderbird, Postbox
SeaMonkey
Toggle Toolbar
Toggle the main toolbar from showing to hidden. Don't place it on the main toolbar, it is disabled then and will not work.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Not Junk
Mark the selected messages as Not Junk.
Compatibility:
Thunderbird, Postbox
SeaMonkey
Select All
Select all the text in the current text box, web page, etc.
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
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
Customize Toolbar
Open the customize toolbar window to add or remove items from your toolbar.
The customize Toolbar window is where every button from this extension and others like it get placed for you to then move to your toolbar. Creating the perfect set up is always a moving target that is never quite achieved, but this will make it a little quicker to get there.
Compatibility:
Pale Moon
Thunderbird, Postbox
SeaMonkey
Return Receipt
Toggle the sending of a return receipt on and off.
Compatibility:
Thunderbird, Postbox
SeaMonkey