Terrible contrast? Firefox's accessibility inspector gives the text a contrast ratio of 15.17, with 4.5 being the minimum for what qualifies as good and 7 as the recommended minimum for good readability.
I change text colours in the web inspector a lot because plenty of websites these days are medium gray on light gray with a font-weight of 100, but this clearly isn't one of them. It's fine to say you don't like the colour, but the contrast is great.
It's not that the contrast is low (which is another problem on its own, I agree). It's the other extreme - too high of a contrast [1] by using a fully saturated yellow and black. The same reason you don't use #fff on #000.
I've been using Thunderbird for several years, I got really annoyed with the Windows mail app and Outlook for countless problems. Thunderbird has always been very simple and works great and clean.
Recently - I think version 60 or so, broke minimize to tray, very annoying. But someone fixed it and came out with a new version. It's a feature that must be included in Thunderbird from the get go.
Another great feature is being able to copy a profile folder over to Thunderbird from another machine to another and I have all my emails bang up to date.
