This is a fork of the original extension that fixes some problems.
It gets the favicon URLs from google automatically, but also allows the user to set a custom URL.
The XPI that can be installed into Thunderbird is in the releases tab. Updated to be compatible with Thunderbird 60.*.

Known Bugs:

• Sometimes tabs won't close while the extension is enabled.
• Sometimes tabs are "locked" on the page, and you can't go to a different URL.

The original project is not mantained anymore. Part of the original README follows below.

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WebApp Tabs

This is an extension for Thunderbird which allows you to view webapps in Thunderbird's tabs.

Project Goals

There are many extensions for viewing webpages in Thunderbird. This isn't what I think Thunderbird is for, webpages can be viewed in Firefox or whatever browser you prefer. Thunderbird is my communications centre and I use it to display communications related webapps like Google+, Google Reader, Google Groups, etc. and I want to be able to use those easily, opening links in the default browser where relevant.

The main goals are:

• Allow the user to configure a set of available webapps
• Provide a way for the user to open each webapp in a tab
• Any attempt to open a configured webapp (e.g. from a link in an email or anywhere else) should open it in the existing tab for the webapp if one exists or a new tab for the webapp in Thunderbird
• Any links clicked in the webapp that are to other sites should open in the default browser
• The webapp should behave as well in Thunderbird as it would if opened in Firefox

License

As always feel free to fork. This project is licensed under MPL-2.0.