There's now an extra option on the Search this Thread drop down list on the first post of a thread (along with all the other thread tools) which allows you to search for your own posts within a thread you have posted in.
This way you can easily find where you for an example left if in a fanfiction (if you leave a review after each chapter, *cough cough*) or just to find your last post. See the screen shots for more visual information
Hopefully this will be very useful for everyone!
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