SeaMonkey: Current Problems

Problems with SeaMonkey 1.0.x/1.1.x

"Old XPFE" code is unmaintained in many areas
Bad extension management, almost no UI for that
Incompatibilities with "new toolkit" interfaces
Some old, ugly code that doesn't work well (e.g. wallet)
In some cases, fixes need to be ported to code we don't know and don't want to maintain
"New toolkit" applications "look better" than SeaMonkey (themes looking more native, more modern icons)
No good update mechanism
Lacking some interesting features compared to others (toolbar customization, feed support, etc.)
Need coders, need reviewers
No calendaring support
No profile migration functionality

Solution

Not for everything, but for a lot of those concerns, we have (or are working on) a solution!

This wonder of the future is internally nicknamed "suiterunner".