calling it garbage seems kinda harsh, but I think they are moving more to using a javascript rendering method instead of xul. I remember reading about it a while back. I don't really like it either and one of the first updates from back then broke a lot of UI that had been working ok. I am not really sure what the problems are with working with xul though, but I think firefox moved off it a long time ago too. I feel like thunderbird's user base is more the type to want to use thunderbird because it runs like a local first desktop style app as an alternative to using a web interface to their email. At least that's what I like about it.
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calling it garbage seems kinda harsh, but I think they are moving more to using a javascript rendering method instead of xul. I remember reading about it a while back. I don't really like it either and one of the first updates from back then broke a lot of UI that had been working ok. I am not really sure what the problems are with working with xul though, but I think firefox moved off it a long time ago too. I feel like thunderbird's user base is more the type to want to use thunderbird because it runs like a local first desktop style app as an alternative to using a web interface to their email. At least that's what I like about it.