Rated 4 out of 5 stars

I don't understand why so many people prefer web mail interfaces these days. I feel that a local client like Thunderbird is far more comfortable and flexible to handle, with one exception: The search function in GMail is more convenient to use than the one in Thunderbird. Expression Search / GMailUI brings the same functionality to Thunderbird. For me it works just fine, I couldn't observe any of the bugs that same others have reported in their reviews. However, I did observe one other bug: With this extension installed, the menu bar no longer works. It's still there, but no longer clickable. As all menu bar options are also available from the "hamburger" menu, this is not a disaster. It's still an acceptable trade-off for the added value provided by this extension.

This review is for a previous version of the add-on (1.2).