When you have the list of questions on display, click on the "My Contributions" link at the top of the questions.

I think u may have slightly misunderstood the thrust of my query. If I sign in and then go to Firefox support home page i.e. https://support.mozilla.com/en-US/home, where is the link to my 'account' or the link to the location where my previous questions are stored.

You need to view the list of questions - https://support.mozilla.com/en-US/questions

There is then a link for "My Contributions" at the top of the list of questions - https://support.mozilla.com/en-US/questions?filter=my-contributions

Forgive me for being a bit dumb, but where is the link for the 'list of questions' on the home page for Firefox support i.e. https://support.mozilla.com/en-US/home?

I would have thought that finding my questions would have been OR rather should have been a simple process.