Opening an url as a Thunderbird Tab - Web Apps on Thunderbird - Ex. Trello on Thunderbird

I got this idea after searching for years for a replacement to Thunderbrowse. Or WebPG add on.

I then noticed that after installing add-on, some add-ons would open a web-page as a tab and thought that maybe I could modify one of the about.config variables to open a tab with webpages. It did not work!

I then searched for an user based setup I could create to open such a page, on that process I was studying configuration files information found on the page below:
https://www-archive.mozilla.org/support/thunderbird/edit

After a lot of searches I found this page on Content_Tabs:
https://developer.mozilla.org/en-US/docs/Mozilla/Thunderbird/Content_Tabs

I then finally got the ideal below. It is not perfect but it does open  a page choose by user. I wish I was a little more "technically savy" to really know how to improved this but this is how far I went, just follow steps below:



1) First Open Scratchpad on Thunderbird by pressing (Shift-F4)

2) Copy and paste the content below to the bottom of of the scratchpad,
Components.classes['@mozilla.org/appshell/window-mediator;1'].getService(Components.interfaces.nsIWindowMediator).getMostRecentWindow("mail:3pane").document.getElementById("tabmail").openTab("contentTab", {contentPage: "https://tech-me-out.blogspot.com/2020/02/opening-url-as-thunderbird-tab.html"});

3) Click run on the menu of the Scratchpad, it will open this page as a tab in your browser

4) After testing this, you can then replace this part of the line you added: "https://tech-me-out.blogspot.com/2020/02/opening-url-as-thunderbird-tab.html"  by "your own url address" and it will be opened as a tab on your Thunderbird.

As you can see, some web apps like Trello may work too:




I hope it works for you!