One of the little add-ons for Thunderbird that I like is FireTray.
It’s that little mail notification icon on the task bar that turns into a number when an email arrives and it dispenses with the need to keep checking Thunderbird to see if anything new has arrived.
With the latest release of Thunderbird, FireTray no longer worked. There was no warning – it just failed to appear. As a result I kept missing urgent emails because I wasn’t used to constantly flicking into Thunderbird. I checked Thunderbird’s Add-on area and it merely confirmed that FireTray was incompatible.
I tried the repositories but with no success, but then came across the solution.
In the GitHub site https://github.com/Ximi1970/FireTray/releases/tag/v0.6.2 right click on the file firetray-0.6.2.xpi and save it locally.
Then in Thunderbird, select Tools -> Add Ons. In the window that opens, click on the cog [top right corner] and select “Install Add-On from File” and select the file you have jut downloaded. That will install the updated FireTray.
No more missed emails.