History: VIdentity_installation

!Installation
To install an extension from this page in Thunderbird, right-click on the Download link and save the file to your hard drive using your favorite browser, then start up Thunderbird and go to Tools > Options > Extensions and click Install Extension.
To install the extension in Mozilla, just click on the link above (you will need Software install enabled).
After installing this extension you will get a small button beneath senders address field - if you press it, you are able to change your Identity for this single mail._