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Toggle Proxy Requires Restart
The move to Webextensions by Mozilla for Firefox 57+ has made it impossible to modify about:config, this holds Firefox proxy settings. Therefore, this and many other addons will become obsolite from Firefox 57+ onwards unless Mozilla update the API.
Change Referer Button Requires Restart
Button in the toolbar/status bar to change referer value.
Switch Message Colour Requires Restart
Adds a Toolbar-Button to Thunderbird to switch between the mails' original colouring and your user defined colouring.
Change Requires Restart
In-page Currency Conversion Extension for Thunderbird and Firefox...
To create your own collections, you must have a Mozilla Add-ons account.