Trivially simple but very useful Rated 5 out of 5 stars
This extension enables a feature which I genuinely thought would have been incorporated into Thunderbird by default. After several minutes of searching I was unable to find any way of displaying emails from a particular contact. Thankfully this extension does everything that I need.
The one critique I have would be the lack of easy access to filtering by contact via the quick filter bar, rather than shoving the options into Thunderbird's already huge context menu.
More often than not, the simplest extensions are the most useful. 5/5