Betterbird has the big Get Messages button at the very beginning of the Message Toolbar (which TB does not even have unless you know how to create it) so you don’t need to click that tiny button.
“Oh really? How charmingly totalitarian of you to say that [...] Adieu” Thanks. I like you too. You may not have noticed, but the text you are quoting was not mine. You may wish to take a look at this Comparison Chart. Betterbird is much better than ...
Since you refuse to use the much better Betterbird and insist on using the useless Thunderbird, take a look (as you keep saying) at this comparison chart