Be careful with old versions!
These versions are displayed for reference and testing purposes. You should always use the latest version of an add-on.
Added support for Google Photos and Google Hangouts.
Code efficiency updates.
Added Google News button.
Added Google Books button.
Added Google Play button.
Updated Google Docs button to represent service name change to Google Drive.
Fixed new Doc/Spreadsheet/Presentation buttons so new Drive items can be created inside Thunderbird.
Removed buttons associated with stale services (Wave, Reader).
Updates support for Mozilla Thunderbird though version 26.0.