List of Comments on User Tab
Sometimes I ask other users for clarifications by commenting on questions. How do I find the comments I've written on Stack Overflow?
First click anywhere your name appears as a link, like in top bar. It'll lead you to your profile. Make sure that you're in the Activity tab (this is already the default tab when you check your own profile, but not when you check other's). Then open the all actions secondary tab and finally click the comments tertiairy tab. All comments which you ever posted are tracked there.
More specifically: here.