Never mind, duh!, I found it.

Where can I see whether a question I asked previously has been answered?

• You can click on "My Contributions" -- https://support.mozilla.com/questions?filter=my-contributions (at the top of a main forum page) -- and sort on "Most Recent" (recently updated appear first). You could create a bookmark for the page. (If you check your contributions here regularly, this is a good alternative to using "get email updates" (notifications) -- see upper right corner of a question.)

• Special Search form -- https://support.mozilla.com/en-US/search?a=2&q=

  Select Support Questions and put your username in the Asked by field.

The information above is in my profile, which you can click on the left of the reply.

Thanks, dmcritchie, I found the former posts in general, but you saved me a lot of browse time!

So, instead of putting the elusive and misnamed "my Contributions" somewhere logical (and giving it a quirky money-charity connection instead of calling it "my posts") like under my name of profile, you make us do a major search! Why not simplify it so people don't feel confused. That would make it clear and simple.